refactor(groot): N1.7 style cleanup (utils, imports, flash-attn, config)

Mechanical refactor of the GR00T N1.7 policy to match the repo's architecture and
style standards. No change to policy algorithm/numerics; only UX/CLI and packaging
changes. Tests are intentionally left untouched (out of scope) and need updating
for the removed `model_version` field.

Cleanup & consolidation:
- Add `groot/utils.py` holding the pure, side-effect-free helpers (JSON I/O, value
  coercion, stat flattening, rot6d/SE3 math, language/batch prep) shared by the
  config and processor layers.
- Remove dead code: the unused `resolve_groot_n1_7_backbone_model` cache-resolver
  cluster, `GR00TN17Config.to_filtered_dict/json`, and the `_copy_default` wrapper.

Imports & execution guards:
- Hoist nested imports to module top; relative imports within the package, absolute
  for external modules. The version-gated Qwen3-VL classes import under the single
  `_transformers_available` guard (transformers is pinned >=5.4, which ships them).
- No import-time side effects: `_register_with_transformers()` now runs in
  `GR00TN17.__init__` (idempotent via `register(exist_ok=True)`), and the N1.5 step
  stubs register lazily before pipeline deserialization (idempotent via the
  registry, no run-once globals).
- Gate optional deps at the point of use with `require_package(..., extra="groot")`.

Dependencies & docs:
- Drop `flash-attn` (and its build-only dep `ninja`) from the `groot` extra; default
  to SDPA (numerically equivalent) with opt-in via `--policy.use_flash_attention`.
  Un-comment `lerobot[groot]` in the `all` extra and regenerate `uv.lock`.
- Rewrite the `groot.mdx` install section: flash-attn is a purely optional,
  user-managed optimization that LeRobot neither installs nor requires.

Config & CLI:
- Surface previously-frozen knobs on `GrootConfig` (plumbed into `GR00TN17Config`;
  no-ops at their defaults): inference — `num_inference_timesteps`, `rtc_ramp_rate`,
  `use_flash_attention`; fine-tuning — `tune_top_llm_layers` (partial-LLM tuning)
  and `tune_vlln` (previously hardwired to True).
- Convert the single-valued `model_version` and `n1_7_backbone_model` fields to
  internal constants.
- Keep `base_model_path`: it is NOT equivalent to `pretrained_path` (raw NVIDIA
  checkpoints have no LeRobot `type` field and load only via `base_model_path`) and
  is genuinely user-tunable.
- Keep the deprecated Isaac-GR00T/N1.5 fields (and the dead LoRA fields) as a
  back-compat block so a v0.5.1 N1.5 `config.json` still parses under draccus and is
  rejected with the friendly N1.5 removal message instead of an opaque decode error.

docs/source/groot.mdx

@@ -5,7 +5,7 @@ GR00T is an NVIDIA foundation model family for generalized humanoid robot reason
 LeRobot integrates GR00T N1.7 through the `groot` policy type.
 
 > [!WARNING]
-> **Breaking change:** GR00T N1.5 support was removed from LeRobot, and current releases support GR00T N1.7 only. N1.5 checkpoints, configs, and `--policy.model_version=n1.5` are rejected with a clear error. To keep using an N1.5 checkpoint, pin the last release that supports it: `pip install 'lerobot==0.5.1'`. To use the current release, migrate to GR00T N1.7 (`model_version='n1.7'`, base model [`nvidia/GR00T-N1.7-3B`](https://huggingface.co/nvidia/GR00T-N1.7-3B)).
+> **Breaking change:** GR00T N1.5 support was removed from LeRobot, and current releases support GR00T N1.7 only. N1.5 checkpoints and configs are rejected with a migration note. To keep using an N1.5 checkpoint, pin the last release that supports it: `pip install 'lerobot==0.5.1'`. To use the current release, migrate to GR00T N1.7 (base model [`nvidia/GR00T-N1.7-3B`](https://huggingface.co/nvidia/GR00T-N1.7-3B)).
 
 ## Model Overview
 
@@ -31,46 +31,43 @@ This approach allows the model to be highly adaptable through post-training for
 
 ## Installation Requirements
 
-GR00T is intended for NVIDIA GPU-accelerated systems. The `groot` extra still includes Flash Attention on non-macOS platforms, and Flash Attention needs a compatible PyTorch/CUDA environment before it is installed. Install the dependencies in this order:
+GR00T is intended for NVIDIA GPU-accelerated systems. Install LeRobot with the GR00T extra:
 
-1. Follow the Environment Setup in the [Installation Guide](./installation). Do not install `lerobot` yet.
-2. Install PyTorch, TorchVision, and the build dependencies used by Flash Attention:
+```bash
+pip install "lerobot[groot]"
+```
+
+For a source checkout:
+
+```bash
+pip install -e ".[groot]"
+```
+
+### Optional: Flash Attention acceleration
+
+Flash Attention is a purely optional performance optimization. **LeRobot neither installs nor requires it**, and setting it up is up to the user as it has environment-specific build requirements (a matching PyTorch/CUDA toolchain). To enable it:
+
+1. Install a `flash-attn` build matching your PyTorch/CUDA environment (see the [Flash Attention project](https://github.com/Dao-AILab/flash-attention)):
 
 ```bash
 # Check https://pytorch.org/get-started/locally/ for the right CUDA wheel index for your system.
 pip install "torch>=2.7,<2.12.0" "torchvision>=0.22.0,<0.27.0" \
   --index-url https://download.pytorch.org/whl/cu128
 pip install "ninja>=1.11.1,<2.0.0" "packaging>=24.2,<26.0"
-```
-
-3. Install and verify Flash Attention:
-
-```bash
 pip install "flash-attn>=2.5.9,<3.0.0" --no-build-isolation
 python -c "import flash_attn; print(f'Flash Attention {flash_attn.__version__} imported successfully')"
 ```
 
-4. Install LeRobot with the GR00T extra:
+2. Install lerobot with the groot extra.
 
-```bash
-pip install "lerobot[groot]"
-```
-
-For a source checkout, use the same order, then install the local package with:
-
-```bash
-pip install -e ".[groot]"
-```
-
-If your CUDA/PyTorch build needs a different Flash Attention wheel or source build, follow the [Flash Attention project](https://github.com/Dao-AILab/flash-attention) instructions, but keep the same ordering: PyTorch first, Flash Attention next, then `lerobot[groot]`.
+3. Opt in by passing `--policy.use_flash_attention=true` when training/evaluating GR00T. If the kernel is missing or fails to import, the backbone transparently falls back to SDPA.
 
 ## Usage
 
 To use GR00T N1.7:
 
 ```bash
---policy.type=groot \
---policy.model_version=n1.7
+--policy.type=groot
 ```
 
 ## Training
@@ -142,7 +139,6 @@ hf download nvidia/GR00T-N1.7-LIBERO \
 
 lerobot-eval \
   --policy.type=groot \
-  --policy.model_version=n1.7 \
   --policy.base_model_path=./GR00T-N1.7-LIBERO/libero_spatial \
   --policy.embodiment_tag=libero_sim \
   --env.type=libero \

pyproject.toml

@@ -208,8 +208,6 @@ groot = [
     "dm-tree>=0.1.8,<1.0.0",
     "timm>=1.0.0,<1.1.0",
     "decord>=0.6.0,<1.0.0; (platform_machine == 'AMD64' or platform_machine == 'x86_64')",
-    "ninja>=1.11.1,<2.0.0",
-    "flash-attn>=2.5.9,<3.0.0 ; sys_platform != 'darwin'"
 ]
 sarm = ["lerobot[transformers-dep]", "pydantic>=2.0.0,<3.0.0", "faker>=33.0.0,<35.0.0", "lerobot[matplotlib-dep]", "lerobot[qwen-vl-utils-dep]"]
 robometer = ["lerobot[transformers-dep]", "lerobot[qwen-vl-utils-dep]", "lerobot[peft-dep]"]
@@ -280,7 +278,7 @@ all = [
     "lerobot[pi]",
     "lerobot[molmoact2]",
     "lerobot[smolvla]",
-    # "lerobot[groot]", TODO(Steven): Gr00t requires specific installation instructions for flash-attn
+    "lerobot[groot]",
     "lerobot[xvla]",
     "lerobot[hilserl]",
     "lerobot[vla_jepa]",

src/lerobot/policies/groot/configuration_groot.py

@@ -14,9 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import logging
-import os
 from dataclasses import dataclass, field
 from pathlib import Path
 
@@ -24,6 +22,8 @@ from lerobot.configs import FeatureType, NormalizationMode, PolicyFeature, PreTr
 from lerobot.optim import AdamWConfig, CosineDecayWithWarmupSchedulerConfig
 from lerobot.utils.constants import ACTION, OBS_STATE
 
+from .utils import read_json
+
 logger = logging.getLogger(__name__)
 
 GROOT_N1_7 = "n1.7"
@@ -127,12 +127,7 @@ def is_raw_groot_n1_7_checkpoint(model_path: str | Path | None) -> bool:
     else:
         return False
 
-    try:
-        with config_path.open() as f:
-            config = json.load(f)
-    except (OSError, json.JSONDecodeError):
-        return False
-
+    config = read_json(config_path)
     return "type" not in config and _infer_groot_model_version_from_config(config) == GROOT_N1_7
 
 
@@ -141,11 +136,7 @@ def infer_groot_n1_7_embodiment_tag(model_path: str | Path | None) -> str | None
         return None
 
     processor_config_path = Path(model_path).expanduser() / "processor_config.json"
-    try:
-        with processor_config_path.open() as f:
-            processor_config = json.load(f)
-    except (OSError, json.JSONDecodeError):
-        return None
+    processor_config = read_json(processor_config_path)
 
     modality_configs = processor_config.get("processor_kwargs", {}).get("modality_configs", {})
     if not isinstance(modality_configs, dict):
@@ -164,11 +155,7 @@ def infer_groot_n1_7_action_horizon(
         return None
 
     processor_config_path = Path(model_path).expanduser() / "processor_config.json"
-    try:
-        with processor_config_path.open() as f:
-            processor_config = json.load(f)
-    except (OSError, json.JSONDecodeError):
-        return None
+    processor_config = read_json(processor_config_path)
 
     processor_kwargs = processor_config.get("processor_kwargs", {})
     if not isinstance(processor_kwargs, dict):
@@ -210,83 +197,6 @@ def infer_groot_n1_7_action_execution_horizon(
     return action_horizon
 
 
-def resolve_groot_n1_7_backbone_model(model_name: str, cache_dir: str | Path | None = None) -> str:
-    model_path = Path(model_name).expanduser()
-    if model_path.exists():
-        return str(model_path)
-
-    cached_snapshot = _find_cached_hf_snapshot(model_name, cache_dir=cache_dir)
-    return str(cached_snapshot) if cached_snapshot is not None else model_name
-
-
-def _find_cached_hf_snapshot(repo_id: str, cache_dir: str | Path | None = None) -> Path | None:
-    repo_cache_name = f"models--{repo_id.replace('/', '--')}"
-    required_files = (
-        "config.json",
-        "tokenizer_config.json",
-        "preprocessor_config.json",
-        "video_preprocessor_config.json",
-    )
-
-    for hub_cache in _candidate_hf_hub_caches(cache_dir):
-        repo_cache = hub_cache / repo_cache_name
-        snapshots_dir = repo_cache / "snapshots"
-        if not snapshots_dir.is_dir():
-            continue
-
-        candidates: list[Path] = []
-        ref_path = repo_cache / "refs" / "main"
-        try:
-            ref = ref_path.read_text().strip()
-        except OSError:
-            ref = ""
-        if ref:
-            candidates.append(snapshots_dir / ref)
-        candidates.extend(
-            sorted(
-                (path for path in snapshots_dir.iterdir() if path.is_dir()),
-                key=lambda path: path.stat().st_mtime,
-                reverse=True,
-            )
-        )
-
-        seen: set[Path] = set()
-        for snapshot in candidates:
-            if snapshot in seen:
-                continue
-            seen.add(snapshot)
-            if all((snapshot / filename).exists() for filename in required_files):
-                return snapshot
-    return None
-
-
-def _candidate_hf_hub_caches(cache_dir: str | Path | None) -> list[Path]:
-    candidates: list[Path] = []
-    if cache_dir is not None:
-        cache_path = Path(cache_dir).expanduser()
-        candidates.append(cache_path)
-        candidates.append(cache_path / "hub")
-
-    hub_cache = os.environ.get("HUGGINGFACE_HUB_CACHE")
-    if hub_cache:
-        candidates.append(Path(hub_cache).expanduser())
-
-    hf_home = os.environ.get("HF_HOME")
-    if hf_home:
-        candidates.append(Path(hf_home).expanduser() / "hub")
-
-    candidates.append(Path.home() / ".cache" / "huggingface" / "hub")
-
-    deduped: list[Path] = []
-    seen: set[Path] = set()
-    for candidate in candidates:
-        resolved = candidate.resolve() if candidate.exists() else candidate
-        if resolved not in seen:
-            seen.add(resolved)
-            deduped.append(candidate)
-    return deduped
-
-
 def _infer_groot_model_version_from_local_config(model_path: str) -> str | None:
     path = Path(model_path).expanduser()
     if path.is_dir():
@@ -296,16 +206,7 @@ def _infer_groot_model_version_from_local_config(model_path: str) -> str | None:
     else:
         return None
 
-    if not config_path.exists():
-        return None
-
-    try:
-        with config_path.open() as f:
-            config = json.load(f)
-    except (OSError, json.JSONDecodeError):
-        return None
-
-    return _infer_groot_model_version_from_config(config)
+    return _infer_groot_model_version_from_config(read_json(config_path))
 
 
 def _infer_groot_model_version_from_config(config: dict) -> str | None:
@@ -368,15 +269,15 @@ class GrootConfig(PreTrainedConfig):
 
     # Groot-specific model parameters
 
-    # Explicit GR00T model family selection. LeRobot supports GR00T N1.7 only.
-    model_version: str = GROOT_N1_7
-
-    # Path or HuggingFace model ID for the base Groot model
+    # Path or HuggingFace model ID for the base GR00T N1.7 model whose backbone weights and
+    # checkpoint sidecars (statistics.json, processor_config.json, ...) are loaded. This is the
+    # model *source*, and is intentionally distinct from the inherited `pretrained_path`:
+    # `pretrained_path` (`--policy.path`) points at a saved LeRobot checkpoint directory whose
+    # `config.json` carries a `type` field, whereas a raw NVIDIA GR00T checkpoint has no such
+    # field and so can only be loaded through `base_model_path` (`--policy.base_model_path`).
+    # Defaults to GROOT_N1_7_BASE_MODEL when unset (resolved in __post_init__).
     base_model_path: str | None = None
 
-    # HF repo ID (or local path) for the GR00T N1.7 Cosmos/Qwen3-VL backbone processor.
-    n1_7_backbone_model: str = GROOT_N1_7_BACKBONE_MODEL
-
     # Optional named action transform applied after raw N1.7 checkpoint decoding and before env.step().
     # 'auto' (default) resolves to the embodiment default ('libero' for 'libero_sim', otherwise no
     # transform). Pass 'none' to explicitly disable the transform, including for 'libero_sim'.
@@ -399,20 +300,31 @@ class GrootConfig(PreTrainedConfig):
     # Whether to fine-tune the diffusion model
     tune_diffusion_model: bool = True
 
-    # LoRA parameters (from groot_finetune_script.py)
-    # Rank for the LORA model. If 0, no LORA will be used.
-    lora_rank: int = 0
+    # Whether to fine-tune the VL LayerNorm + VL self-attention projector in the action head.
+    tune_vlln: bool = True
 
-    # Alpha value for the LORA model
-    lora_alpha: int = 16
+    # Number of top LLM backbone layers to fine-tune (0 = none). Lets you adapt just the final
+    # language layers without unfreezing the whole backbone; independent of `tune_llm`, which tunes
+    # the entire LLM.
+    tune_top_llm_layers: int = 0
 
-    # Dropout rate for the LORA model
-    lora_dropout: float = 0.1
+    # Inference-time knob: Number of flow-matching denoising steps used to decode an action chunk.
+    # Trades inference latency for action quality.
+    # None keeps the checkpoint value (GR00T N1.7 default: 4).
+    num_inference_timesteps: int | None = None
 
-    # Whether to use the full model for LORA
-    lora_full_model: bool = False
+    # Inference-time knob: Real-Time Chunking (RTC) overlap-blend ramp rate, used when the RTC engine
+    # supplies a previous-chunk prefix. Higher values blend the overlapping prefix more aggressively.
+    # None keeps the checkpoint value (GR00T N1.7 default: 6.0).
+    rtc_ramp_rate: float | None = None
 
-    # Training parameters (matching groot_finetune_script.py)
+    # Inference-time knob: Whether to request the flash-attention-2 kernel for the Qwen3-VL backbone.
+    # flash-attn is an optional, user-managed optimization; when it is absent (the default),
+    # the backbone transparently falls back to SDPA, which is numerically equivalent.
+    # Set to True only after installing a flash-attn build matching your torch/CUDA env.
+    use_flash_attention: bool = False
+
+    # Training parameters
     optimizer_lr: float = 1e-4
     optimizer_betas: tuple[float, float] = (0.95, 0.999)
     optimizer_eps: float = 1e-8
@@ -421,12 +333,18 @@ class GrootConfig(PreTrainedConfig):
     use_bf16: bool = True
 
     # TODO(Steven): Remove these deprecated fields in a future release.
-    # Deprecated Isaac-GR00T runner/N1.5 fields below — unused by the LeRobot N1.7 implementation
-    # (nothing in src/lerobot reads them). They are kept only so config.json files saved by
-    # earlier lerobot releases still parse: draccus rejects unknown fields, so removing them
-    # would break every previously saved groot checkpoint at config-load time.
+    # Deprecated Isaac-GR00T runner / GR00T N1.5 fields, plus the (never-wired) LoRA fields — all
+    # unused by the LeRobot N1.7 implementation except the `tokenizer_assets_repo` N1.5 tripwire and
+    # the `image_size` legacy remap in __post_init__. They are kept ONLY so a config.json saved by an
+    # earlier lerobot release (notably a GR00T N1.5 checkpoint) still parses under draccus — which
+    # rejects unknown fields — and is then rejected with a clear N1.5 removal message rather than an
+    # opaque draccus decoding error.
     image_size: tuple[int, int] = (256, 256)  # image sizing is handled by the backbone's image processor.
     tokenizer_assets_repo: str | None = None
+    lora_rank: int = 0
+    lora_alpha: int = 16
+    lora_dropout: float = 0.1
+    lora_full_model: bool = False
     video_backend: str = "decord"
     balance_dataset_weights: bool = True
     balance_trajectory_weights: bool = True
@@ -446,7 +364,6 @@ class GrootConfig(PreTrainedConfig):
                 f"like a legacy GR00T N1.5 checkpoint or config. {GROOT_N1_5_REMOVAL_GUIDANCE}"
             )
 
-        self.model_version = normalize_groot_model_version(self.model_version)
         self.action_decode_transform = normalize_groot_action_decode_transform(self.action_decode_transform)
         if self.base_model_path is None:
             self.base_model_path = GROOT_N1_7_BASE_MODEL
@@ -491,9 +408,9 @@ class GrootConfig(PreTrainedConfig):
                 setattr(self, field_name, n1_7_value)
 
         inferred_version = infer_groot_model_version(self.base_model_path)
-        if inferred_version is not None and inferred_version != self.model_version:
+        if inferred_version is not None and inferred_version != GROOT_N1_7:
             message = (
-                f"GR00T model_version '{self.model_version}' does not match base_model_path "
+                f"GR00T model_version '{GROOT_N1_7}' does not match base_model_path "
                 f"'{self.base_model_path}', which looks like '{inferred_version}'."
             )
             if inferred_version == GROOT_N1_5:
@@ -507,9 +424,6 @@ class GrootConfig(PreTrainedConfig):
                 f"n_action_steps ({self.n_action_steps}) cannot exceed chunk_size ({self.chunk_size})"
             )
 
-        # groot_repo_path is now optional since we ported the components
-        # No validation needed
-
     def validate_features(self) -> None:
         """Validate and set up input/output features for Groot."""
         image_features = [key for key, feat in self.input_features.items() if feat.type == FeatureType.VISUAL]

src/lerobot/policies/groot/groot_n1_7.py

@@ -16,7 +16,6 @@
 from __future__ import annotations
 
 import importlib
-import json
 import logging
 from contextlib import suppress
 from copy import deepcopy
@@ -35,7 +34,14 @@ from .action_head.cross_attention_dit import AlternateVLDiT, DiT, SelfAttentionT
 from .configuration_groot import N1_7_DEFAULT_IMAGE_CROP_SIZE, N1_7_DEFAULT_IMAGE_TARGET_SIZE
 
 if TYPE_CHECKING or _transformers_available:
-    from transformers import AutoConfig, AutoModel, PretrainedConfig, PreTrainedModel
+    from transformers import (
+        AutoConfig,
+        AutoModel,
+        PretrainedConfig,
+        PreTrainedModel,
+        Qwen3VLConfig,
+        Qwen3VLForConditionalGeneration,
+    )
     from transformers.feature_extraction_utils import BatchFeature
 else:
     AutoConfig = None
@@ -43,25 +49,17 @@ else:
     PretrainedConfig = object
     PreTrainedModel = object
     BatchFeature = None
+    Qwen3VLConfig = None
+    Qwen3VLForConditionalGeneration = None
 
 try:
     import tree
 except ImportError:
     tree = None
 
-try:
-    from transformers import Qwen3VLConfig, Qwen3VLForConditionalGeneration
-except ImportError:
-    Qwen3VLConfig = None
-    Qwen3VLForConditionalGeneration = None
-
 logger = logging.getLogger(__name__)
 
 
-def _copy_default(value: Any) -> Any:
-    return deepcopy(value)
-
-
 GR00T_N1_7_DEFAULTS: dict[str, Any] = {
     "model_dtype": "bfloat16",
     "dtype": "bfloat16",
@@ -74,7 +72,7 @@ GR00T_N1_7_DEFAULTS: dict[str, Any] = {
     "tune_visual": False,
     "select_layer": 16,
     "reproject_vision": False,
-    "use_flash_attention": True,
+    "use_flash_attention": False,
     "load_bf16": False,
     "backbone_trainable_params_fp32": True,
     "image_crop_size": N1_7_DEFAULT_IMAGE_CROP_SIZE,
@@ -152,29 +150,10 @@ class GR00TN17Config(PretrainedConfig):
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
         for key, value in GR00T_N1_7_DEFAULTS.items():
-            setattr(self, key, _copy_default(kwargs.pop(key, value)))
+            setattr(self, key, deepcopy(kwargs.pop(key, value)))
         for key, value in kwargs.items():
             setattr(self, key, value)
 
-    def to_filtered_dict(self, exclude_augment: bool = True) -> dict[str, Any]:
-        cfg = self.to_dict()
-        if not exclude_augment:
-            return cfg
-        exclude_keys = {
-            "random_rotation_angle",
-            "color_jitter_params",
-            "use_albumentations_transforms",
-            "formalize_language",
-            "image_crop_size",
-            "image_target_size",
-            "shortest_image_edge",
-            "crop_fraction",
-        }
-        return {k: v for k, v in cfg.items() if k not in exclude_keys}
-
-    def to_filtered_json(self, exclude_augment: bool = True, **kwargs) -> str:
-        return json.dumps(self.to_filtered_dict(exclude_augment), indent=2, default=str, **kwargs)
-
 
 class CategorySpecificLinear(nn.Module):
     """Linear layer with category-specific weights for multi-embodiment support."""
@@ -275,13 +254,7 @@ class Qwen3Backbone(nn.Module):
         transformers_loading_kwargs: dict[str, Any] | None = None,
         load_pretrained_weights: bool = True,
     ):
-        if Qwen3VLForConditionalGeneration is None:
-            raise ImportError(
-                "Qwen3VLForConditionalGeneration is required for GR00T N1.7. "
-                "Install the GR00T optional dependencies with `pip install 'lerobot[groot]'` "
-                "or use a transformers version that provides Qwen3-VL support."
-            )
-
+        require_package("transformers", extra="groot")
         super().__init__()
         transformers_loading_kwargs = transformers_loading_kwargs or {"trust_remote_code": True}
 
@@ -361,11 +334,6 @@ class Qwen3Backbone(nn.Module):
         if _is_cosmos_reason2_backbone(model_name):
             backbone_config = _cosmos_reason2_qwen3_vl_config()
         else:
-            if AutoConfig is None:
-                raise ImportError(
-                    "AutoConfig is required to initialize a GR00T N1.7 backbone from config. "
-                    "Install the GR00T optional dependencies with `pip install 'lerobot[groot]'`."
-                )
             backbone_config = AutoConfig.from_pretrained(model_name, **config_kwargs)
         return Qwen3VLForConditionalGeneration._from_config(backbone_config, **model_kwargs)
 
@@ -762,11 +730,6 @@ def _is_cosmos_reason2_backbone(model_name: str) -> bool:
 
 
 def _cosmos_reason2_qwen3_vl_config() -> PretrainedConfig:
-    if Qwen3VLConfig is None:
-        raise ImportError(
-            "Qwen3VLConfig is required for GR00T N1.7. "
-            "Install the GR00T optional dependencies with `pip install 'lerobot[groot]'`."
-        )
     return Qwen3VLConfig(
         image_token_id=151655,
         video_token_id=151656,
@@ -844,6 +807,7 @@ class GR00TN17(PreTrainedModel):
         transformers_loading_kwargs: dict[str, Any] | None = None,
         load_backbone_weights: bool = True,
     ):
+        _register_with_transformers()
         super().__init__(config)
         transformers_loading_kwargs = transformers_loading_kwargs or {"trust_remote_code": True}
         self.config = config
@@ -949,6 +913,12 @@ class GR00TN17(PreTrainedModel):
 
 
 def _register_with_transformers() -> None:
+    """Register GR00T N1.7 with transformers' Auto* factories.
+
+    Idempotent: ``register(..., exist_ok=True)`` makes repeat calls no-ops (with a fallback that
+    suppresses the already-registered error on transformers builds whose ``register()`` predates
+    ``exist_ok``), so no run-once guard is needed.
+    """
     if AutoConfig is None or AutoModel is None:
         return
     try:
@@ -961,6 +931,3 @@ def _register_with_transformers() -> None:
     except TypeError:
         with suppress(ValueError):
             AutoModel.register(GR00TN17Config, GR00TN17)
-
-
-_register_with_transformers()

src/lerobot/policies/groot/modeling_groot.py

@@ -30,6 +30,9 @@ from pathlib import Path
 from typing import TypeVar
 
 import torch
+from huggingface_hub import hf_hub_download
+from huggingface_hub.constants import SAFETENSORS_SINGLE_FILE
+from huggingface_hub.errors import HfHubHTTPError
 from torch import Tensor
 
 from lerobot.configs import FeatureType, PolicyFeature
@@ -46,8 +49,8 @@ from .configuration_groot import (
     infer_groot_model_version,
     infer_groot_n1_7_action_execution_horizon,
     infer_groot_n1_7_action_horizon,
-    normalize_groot_model_version,
 )
+from .groot_n1_7 import GR00TN17
 
 logger = logging.getLogger(__name__)
 
@@ -74,27 +77,30 @@ class GrootPolicy(PreTrainedPolicy):
         self.reset()
 
     def _create_groot_model(self):
-        """Create and initialize the GR00T N1.7 model using Isaac-GR00T APIs."""
-        # Handle Flash Attention compatibility issues
-        self._handle_flash_attention_compatibility()
-
+        """Create and initialize the GR00T N1.7 model using the ported components."""
         model_kwargs = {
             "pretrained_model_name_or_path": self.config.base_model_path,
             "tune_llm": self.config.tune_llm,
             "tune_visual": self.config.tune_visual,
             "tune_projector": self.config.tune_projector,
             "tune_diffusion_model": self.config.tune_diffusion_model,
+            # Forwarded as a GR00TN17Config override; read back by set_trainable_parameters.
+            "tune_top_llm_layers": self.config.tune_top_llm_layers,
+            "use_flash_attention": self.config.use_flash_attention,
         }
-        from .groot_n1_7 import GR00TN17
+        # Surface the inference-time knobs onto the model config only when the user set them; None
+        # leaves the value baked into the checkpoint untouched.
+        if self.config.num_inference_timesteps is not None:
+            model_kwargs["num_inference_timesteps"] = self.config.num_inference_timesteps
+        if self.config.rtc_ramp_rate is not None:
+            model_kwargs["rtc_ramp_rate"] = self.config.rtc_ramp_rate
 
-        model = GR00TN17.from_pretrained(
+        return GR00TN17.from_pretrained(
             **model_kwargs,
-            tune_vlln=True,
+            tune_vlln=self.config.tune_vlln,
             transformers_loading_kwargs={"trust_remote_code": True},
         )
 
-        return model
-
     def reset(self):
         """Reset policy state when environment resets."""
         self._action_queue = deque([], maxlen=self._action_queue_steps)
@@ -137,15 +143,7 @@ class GrootPolicy(PreTrainedPolicy):
         Returns:
             Initialized GrootPolicy instance with loaded model
         """
-        from huggingface_hub import hf_hub_download
-        from huggingface_hub.constants import SAFETENSORS_SINGLE_FILE
-        from huggingface_hub.errors import HfHubHTTPError
-
-        requested_version = (
-            normalize_groot_model_version(config.model_version)
-            if config is not None
-            else infer_groot_model_version(str(pretrained_name_or_path)) or GROOT_N1_7
-        )
+        requested_version = infer_groot_model_version(str(pretrained_name_or_path)) or GROOT_N1_7
         logger.info(
             "The Groot policy wraps NVIDIA's GR00T %s model. Loading pretrained model from: %s",
             requested_version,
@@ -199,10 +197,8 @@ class GrootPolicy(PreTrainedPolicy):
         logger.info("Detected base GR00T model, loading from HuggingFace...")
 
         if config is None:
-            model_version = infer_groot_model_version(str(pretrained_name_or_path)) or GROOT_N1_7
             # Create default config with the pretrained path
             config = GrootConfig(
-                model_version=model_version,
                 base_model_path=str(pretrained_name_or_path),
             )
 
@@ -225,11 +221,10 @@ class GrootPolicy(PreTrainedPolicy):
             if hasattr(config, key):
                 setattr(config, key, value)
 
-        config.model_version = normalize_groot_model_version(config.model_version)
         inferred_version = infer_groot_model_version(config.base_model_path)
-        if inferred_version is not None and inferred_version != config.model_version:
+        if inferred_version is not None and inferred_version != GROOT_N1_7:
             message = (
-                f"GR00T model_version '{config.model_version}' does not match base_model_path "
+                f"GR00T model_version '{GROOT_N1_7}' does not match base_model_path "
                 f"'{config.base_model_path}', which looks like '{inferred_version}'."
             )
             if inferred_version == GROOT_N1_5:
@@ -432,13 +427,11 @@ class GrootPolicy(PreTrainedPolicy):
         # During inference, we do not pass action because it is predicted.
         # N1.7 still carries a 2-D action horizon mask from its checkpoint processor.
         groot_inputs = self._filter_groot_inputs(batch, include_action=False)
-        groot_options = None
-        if self.config.model_version == GROOT_N1_7:
-            groot_inputs, groot_options = self._prepare_n1_7_rtc_inputs(
-                groot_inputs,
-                inference_delay=kwargs.get("inference_delay"),
-                prev_chunk_left_over=kwargs.get("prev_chunk_left_over"),
-            )
+        groot_inputs, groot_options = self._prepare_n1_7_rtc_inputs(
+            groot_inputs,
+            inference_delay=kwargs.get("inference_delay"),
+            prev_chunk_left_over=kwargs.get("prev_chunk_left_over"),
+        )
 
         # Get device from model parameters
         device = get_device_from_parameters(self)
@@ -469,26 +462,3 @@ class GrootPolicy(PreTrainedPolicy):
             actions = self.predict_action_chunk(batch)
             self._action_queue.extend(actions[:, : self._action_queue_steps].transpose(0, 1))
         return self._action_queue.popleft()
-
-    # -------------------------
-    # Internal helpers
-    # -------------------------
-    def _handle_flash_attention_compatibility(self) -> None:
-        """Log Flash Attention availability (diagnostic only).
-
-        The GR00T N1.7 backbone automatically falls back to SDPA when ``flash_attn`` is
-        unavailable (see ``Qwen3Backbone``), so this probe only emits a hint; it does not
-        change behaviour or mutate global state.
-        """
-        try:
-            import flash_attn
-
-            logger.debug("Flash Attention %s is available.", flash_attn.__version__)
-        except ImportError:
-            logger.debug("Flash Attention is not installed; the GR00T backbone will use SDPA.")
-        except Exception as e:  # noqa: BLE001
-            logger.warning(
-                "Flash Attention failed to import (%s); the GR00T backbone will use SDPA. If this is "
-                "an 'undefined symbol' error, reinstall a flash-attn build matching your torch version.",
-                e,
-            )

src/lerobot/policies/groot/processor_groot.py

@@ -14,7 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import logging
 from copy import copy
 from dataclasses import dataclass, field, fields, is_dataclass
@@ -28,12 +27,22 @@ from einops import rearrange
 from PIL import Image
 from torchvision.transforms import InterpolationMode
 
-from lerobot.utils.import_utils import _transformers_available
+from lerobot.utils.import_utils import _transformers_available, require_package
 
 if TYPE_CHECKING or _transformers_available:
-    from transformers import ProcessorMixin
+    from transformers import (
+        AutoTokenizer,
+        ProcessorMixin,
+        Qwen2VLImageProcessor,
+        Qwen3VLProcessor,
+        Qwen3VLVideoProcessor,
+    )
 else:
+    AutoTokenizer = None
     ProcessorMixin = object
+    Qwen2VLImageProcessor = None
+    Qwen3VLProcessor = None
+    Qwen3VLVideoProcessor = None
 
 from lerobot.processor import (
     AbsoluteActionsProcessorStep,
@@ -70,6 +79,19 @@ from .configuration_groot import (
     GrootConfig,
     is_raw_groot_n1_7_checkpoint,
 )
+from .utils import (
+    as_int_pair,
+    as_optional_float,
+    as_optional_int,
+    config_value,
+    flatten_n1_7_modality_stats,
+    has_modality_stats,
+    infer_n1_7_batch_size_and_device,
+    prepare_n1_7_language_batch,
+    read_json,
+    relative_eef_to_absolute,
+    stat_dim_from_entry,
+)
 
 N1_7_EMBODIMENT_MAPPING = {
     "oxe_droid_relative_eef_relative_joint": 24,
@@ -128,12 +150,12 @@ def _load_n1_7_checkpoint_processor_assets(config: GrootConfig) -> _GrootN17Chec
         return None
 
     checkpoint_path = Path(config.base_model_path).expanduser()
-    processor_config = _read_json(checkpoint_path / "processor_config.json")
+    processor_config = read_json(checkpoint_path / "processor_config.json")
     processor_kwargs = processor_config.get("processor_kwargs", {})
     if not isinstance(processor_kwargs, dict):
         processor_kwargs = {}
 
-    all_stats = _read_json(checkpoint_path / "statistics.json")
+    all_stats = read_json(checkpoint_path / "statistics.json")
     raw_stats = all_stats.get(config.embodiment_tag)
     if not isinstance(raw_stats, dict):
         raw_stats = {}
@@ -185,25 +207,16 @@ def _load_n1_7_checkpoint_processor_assets(config: GrootConfig) -> _GrootN17Chec
         use_relative_action=use_relative_action,
         clip_outliers=clip_outliers,
         video_modality_keys=video_modality_keys,
-        image_crop_size=_as_int_pair(processor_kwargs.get("image_crop_size")),
-        image_target_size=_as_int_pair(processor_kwargs.get("image_target_size")),
-        shortest_image_edge=_as_optional_int(processor_kwargs.get("shortest_image_edge")),
-        crop_fraction=_as_optional_float(processor_kwargs.get("crop_fraction")),
+        image_crop_size=as_int_pair(processor_kwargs.get("image_crop_size")),
+        image_target_size=as_int_pair(processor_kwargs.get("image_target_size")),
+        shortest_image_edge=as_optional_int(processor_kwargs.get("shortest_image_edge")),
+        crop_fraction=as_optional_float(processor_kwargs.get("crop_fraction")),
         use_albumentations=use_albumentations,
     )
 
 
-def _read_json(path: Path) -> dict[str, Any]:
-    try:
-        with path.open() as f:
-            data = json.load(f)
-    except (OSError, json.JSONDecodeError):
-        return {}
-    return data if isinstance(data, dict) else {}
-
-
 def _load_n1_7_embodiment_mapping(checkpoint_path: Path) -> dict[str, int] | None:
-    mapping = _read_json(checkpoint_path / "embodiment_id.json")
+    mapping = read_json(checkpoint_path / "embodiment_id.json")
     if not mapping:
         return None
     parsed: dict[str, int] = {}
@@ -234,7 +247,7 @@ def _load_n1_7_checkpoint_stats(
     """
 
     if raw_stats is None:
-        all_stats = _read_json(checkpoint_path / "statistics.json")
+        all_stats = read_json(checkpoint_path / "statistics.json")
         raw_stats = all_stats.get(embodiment_tag)
     if not isinstance(raw_stats, dict):
         return {}
@@ -249,14 +262,14 @@ def _load_n1_7_checkpoint_stats(
 
     use_percentiles = processor_kwargs.get("use_percentiles", False)
     return {
-        OBS_STATE: _flatten_n1_7_modality_stats(
+        OBS_STATE: flatten_n1_7_modality_stats(
             embodiment_stats=raw_stats,
             embodiment_config=modality_config,
             modality="state",
             use_percentiles=bool(use_percentiles),
             use_relative_action=use_relative_action,
         ),
-        ACTION: _flatten_n1_7_modality_stats(
+        ACTION: flatten_n1_7_modality_stats(
             embodiment_stats=raw_stats,
             embodiment_config=modality_config,
             modality="action",
@@ -324,134 +337,6 @@ def _load_n1_7_checkpoint_video_modality_keys(
     return keys or None
 
 
-def _as_int_pair(value: Any) -> list[int] | None:
-    if not isinstance(value, (list, tuple)) or len(value) != 2:
-        return None
-    try:
-        return [int(value[0]), int(value[1])]
-    except (TypeError, ValueError):
-        return None
-
-
-def _as_optional_int(value: Any) -> int | None:
-    if value is None:
-        return None
-    try:
-        return int(value)
-    except (TypeError, ValueError):
-        return None
-
-
-def _as_optional_float(value: Any) -> float | None:
-    if value is None:
-        return None
-    try:
-        return float(value)
-    except (TypeError, ValueError):
-        return None
-
-
-def _flatten_n1_7_modality_stats(
-    *,
-    embodiment_stats: dict[str, Any],
-    embodiment_config: dict[str, Any],
-    modality: str,
-    use_percentiles: bool,
-    use_relative_action: bool,
-) -> dict[str, list[float]]:
-    """Flatten one N1.7 modality's grouped statistics in checkpoint order.
-
-    When checkpoints request percentile normalization, q01/q99 replace min/max
-    for regular groups. Relative action groups read from ``relative_action``
-    stats and keep min/max, matching Isaac-GR00T's processor override.
-    """
-
-    source_stats = embodiment_stats.get(modality, {})
-    modality_config = embodiment_config.get(modality, {})
-    if not isinstance(source_stats, dict) or not isinstance(modality_config, dict):
-        return {}
-    modality_keys = modality_config.get("modality_keys", [])
-    if not isinstance(modality_keys, list):
-        return {}
-
-    flattened: dict[str, list[float]] = {}
-    action_configs = modality_config.get("action_configs", []) if modality == "action" else []
-    if not isinstance(action_configs, list):
-        action_configs = []
-    relative_stats = embodiment_stats.get("relative_action", {})
-    if not isinstance(relative_stats, dict):
-        relative_stats = {}
-
-    for stat_name in ("min", "max", "mean", "std"):
-        values: list[float] = []
-        source_stat_name = stat_name
-        if use_percentiles and stat_name == "min":
-            source_stat_name = "q01"
-        elif use_percentiles and stat_name == "max":
-            source_stat_name = "q99"
-
-        for idx, modality_key in enumerate(modality_keys):
-            if not isinstance(modality_key, str):
-                continue
-            key_source_stats = source_stats
-            key_stat_name = source_stat_name
-            if modality == "action" and use_relative_action and idx < len(action_configs):
-                action_config = action_configs[idx]
-                if isinstance(action_config, dict) and _config_value(action_config.get("rep")) == "relative":
-                    key_source_stats = relative_stats
-                    key_stat_name = stat_name
-            key_stats = key_source_stats.get(modality_key, {})
-            if not isinstance(key_stats, dict):
-                raise KeyError(f"Missing statistics for {modality}.{modality_key}")
-            raw_values = key_stats.get(key_stat_name)
-            if raw_values is None:
-                raise KeyError(f"Missing '{key_stat_name}' statistics for {modality}.{modality_key}")
-            values.extend(_as_float_list(raw_values))
-        if values:
-            flattened[stat_name] = values
-
-    return flattened
-
-
-def _as_float_list(values: Any) -> list[float]:
-    if values is None:
-        return []
-    if isinstance(values, torch.Tensor):
-        return values.detach().cpu().reshape(-1).float().tolist()
-    if isinstance(values, np.ndarray):
-        return values.reshape(-1).astype(np.float32).tolist()
-    if isinstance(values, (list, tuple)):
-        flattened: list[float] = []
-        for value in values:
-            flattened.extend(_as_float_list(value))
-        return flattened
-    return [float(values)]
-
-
-def _config_value(value: Any) -> str:
-    if hasattr(value, "value"):
-        value = value.value
-    text = str(value).lower()
-    return {
-        "relative": "relative",
-        "absolute": "absolute",
-        "delta": "delta",
-        "eef": "eef",
-        "non_eef": "non_eef",
-        "default": "default",
-        "xyz_rot6d": "xyz+rot6d",
-        "xyz+rot6d": "xyz+rot6d",
-        "xyz_rotvec": "xyz+rotvec",
-        "xyz+rotvec": "xyz+rotvec",
-    }.get(text, text)
-
-
-def _has_modality_stats(stats: dict[str, dict[str, Any]] | None) -> bool:
-    if not stats:
-        return False
-    return any(bool(modality_stats) for modality_stats in stats.values())
-
-
 # GR00T normalizes state/action inside its own processor steps and so deliberately has no
 # NormalizerProcessorStep/UnnormalizerProcessorStep (see GrootConfig.normalization_mapping, which is
 # IDENTITY for every feature). lerobot-train nonetheless emits these standard override keys
@@ -603,6 +488,9 @@ def _load_groot_processor_pipelines(
     PolicyProcessorPipeline[dict[str, Any], dict[str, Any]],
     PolicyProcessorPipeline[PolicyAction, PolicyAction],
 ]:
+    # Register the GR00T N1.5 rejection stubs before deserializing, so a saved N1.5 pipeline
+    # referencing their registry names fails with the canonical removal guidance.
+    _register_removed_n1_5_step_stubs()
     preprocessor = PolicyProcessorPipeline.from_pretrained(
         pretrained_model_name_or_path=pretrained_path,
         config_filename=preprocessor_config_filename,
@@ -701,7 +589,7 @@ def make_groot_pre_post_processors(
         else action_horizon
     )
     checkpoint_stats = checkpoint_assets.stats if checkpoint_assets is not None else None
-    checkpoint_has_stats = _has_modality_stats(checkpoint_stats)
+    checkpoint_has_stats = has_modality_stats(checkpoint_stats)
     padded_stats = checkpoint_stats if checkpoint_has_stats else (dataset_stats or {})
     embodiment_mapping = (
         checkpoint_assets.embodiment_mapping
@@ -757,7 +645,7 @@ def make_groot_pre_post_processors(
         AddBatchDimensionProcessorStep(),
         pack_step,
         GrootN17VLMEncodeStep(
-            model_name=config.n1_7_backbone_model,
+            model_name=GROOT_N1_7_BACKBONE_MODEL,
             image_crop_size=image_crop_size,
             image_target_size=image_target_size,
             shortest_image_edge=shortest_image_edge,
@@ -768,7 +656,7 @@ def make_groot_pre_post_processors(
         DeviceProcessorStep(device=config.device),
     ]
 
-    if checkpoint_assets is not None and not checkpoint_has_stats and not _has_modality_stats(padded_stats):
+    if checkpoint_assets is not None and not checkpoint_has_stats and not has_modality_stats(padded_stats):
         raise ValueError(
             f"GR00T N1.7 checkpoint '{config.base_model_path}' has no statistics for embodiment tag "
             f"'{config.embodiment_tag}', and no dataset stats were provided to fall back to, so "
@@ -846,66 +734,8 @@ def _align_video_horizon(video: np.ndarray, horizon: int | None) -> np.ndarray:
     return np.concatenate([pad, video], axis=1)
 
 
-def _infer_n1_7_batch_size_and_device(
-    obs: dict[str, Any], action: torch.Tensor | None
-) -> tuple[int, torch.device]:
-    for value in list(obs.values()) + [action]:
-        if isinstance(value, torch.Tensor):
-            return value.shape[0], value.device
-    video = obs.get("video")
-    if isinstance(video, np.ndarray):
-        return video.shape[0], torch.device("cpu")
-    return 1, torch.device("cpu")
-
-
-def _prepare_n1_7_language_batch(
-    language: Any,
-    batch_size: int,
-    *,
-    formalize_language: bool,
-) -> list[str]:
-    default_language = "Perform the task."
-    if language is None or (isinstance(language, str) and language == ""):
-        languages = [default_language] * batch_size
-    elif isinstance(language, str):
-        languages = [language] * batch_size
-    elif isinstance(language, (list, tuple)):
-        languages = list(language)
-        if len(languages) == 0:
-            languages = [default_language] * batch_size
-        elif len(languages) == 1 and batch_size > 1:
-            languages = languages * batch_size
-        elif len(languages) != batch_size:
-            raise ValueError(
-                f"language batch has {len(languages)} entries, but GR00T N1.7 input batch has {batch_size}."
-            )
-    else:
-        languages = [str(language)] * batch_size
-
-    formatted = []
-    for item in languages:
-        text = str(item) if item else default_language
-        if formalize_language:
-            text = text.lower()
-            text = "".join(ch for ch in text if ch.isalnum() or ch.isspace() or ch == "_")
-        formatted.append(text)
-    return formatted
-
-
 def _build_n1_7_processor(model_name: str = GROOT_N1_7_BACKBONE_MODEL) -> ProcessorMixin:
-    try:
-        from transformers import (
-            AutoTokenizer,
-            Qwen2VLImageProcessor,
-            Qwen3VLProcessor,
-            Qwen3VLVideoProcessor,
-        )
-    except ImportError as exc:
-        raise ImportError(
-            "GR00T N1.7 preprocessing requires a transformers version with Qwen3-VL processor support. "
-            "Install the GR00T optional dependencies with `pip install 'lerobot[groot]'`."
-        ) from exc
-
+    require_package("transformers", extra="groot")
     tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)
     image_processor = Qwen2VLImageProcessor.from_pretrained(model_name, trust_remote_code=True)
     video_processor = Qwen3VLVideoProcessor.from_pretrained(model_name, trust_remote_code=True)
@@ -1201,8 +1031,8 @@ class GrootN17PackInputsStep(ProcessorStep):
             for k in image_keys_to_remove:
                 obs.pop(k, None)
 
-        bsz, _device = _infer_n1_7_batch_size_and_device(obs, transition.get(TransitionKey.ACTION))
-        comp["language"] = _prepare_n1_7_language_batch(
+        bsz, _device = infer_n1_7_batch_size_and_device(obs, transition.get(TransitionKey.ACTION))
+        comp["language"] = prepare_n1_7_language_batch(
             comp.get(self.language_key),
             bsz,
             formalize_language=self.formalize_language,
@@ -1269,7 +1099,7 @@ class GrootN17PackInputsStep(ProcessorStep):
             comp["action_mask"] = action_mask
 
         emb_id = self.embodiment_mapping.get(self.embodiment_tag, 0)
-        bsz, device = _infer_n1_7_batch_size_and_device(obs, transition.get(TransitionKey.ACTION))
+        bsz, device = infer_n1_7_batch_size_and_device(obs, transition.get(TransitionKey.ACTION))
         if "action_mask" not in comp:
             action_mask = torch.zeros(bsz, self.action_horizon, dtype=torch.float32, device=device)
             valid_horizon = min(self.valid_action_horizon, self.action_horizon)
@@ -1432,7 +1262,7 @@ class GrootN17VLMEncodeStep(ProcessorStep):
             return transition
 
         batch_size = int(video.shape[0])
-        languages = _prepare_n1_7_language_batch(
+        languages = prepare_n1_7_language_batch(
             comp.get("language"),
             batch_size,
             formalize_language=False,
@@ -1494,14 +1324,6 @@ class GrootN17VLMEncodeStep(ProcessorStep):
         }
 
 
-def _stat_dim_from_entry(entry: dict[str, Any]) -> int:
-    for stat_name in ("mean", "q01", "min", "max", "std"):
-        value = entry.get(stat_name)
-        if isinstance(value, list) and len(value) > 0:
-            return len(value)
-    return 0
-
-
 def _n1_7_decode_stats_for_action(
     raw_stats: dict[str, Any],
     key: str,
@@ -1512,7 +1334,7 @@ def _n1_7_decode_stats_for_action(
 ) -> tuple[np.ndarray, np.ndarray]:
     """Select the min/max arrays needed to decode one checkpoint action group."""
 
-    is_relative = use_relative_action and _config_value(action_config.get("rep")) == "relative"
+    is_relative = use_relative_action and config_value(action_config.get("rep")) == "relative"
     modality = "relative_action" if is_relative else "action"
     stats = raw_stats.get(modality, {}).get(key, {})
     if not isinstance(stats, dict):
@@ -1537,38 +1359,6 @@ def _n1_7_decode_valid_horizon(action_config: dict[str, Any], action_np: np.ndar
     return max(1, min(action_np.shape[1], len(delta_indices)))
 
 
-def _rot6d_to_matrix(rot6d: np.ndarray) -> np.ndarray:
-    rows = rot6d.reshape(2, 3).astype(np.float64)
-    row1 = rows[0] / np.linalg.norm(rows[0])
-    row2 = rows[1] - np.dot(row1, rows[1]) * row1
-    row2 = row2 / np.linalg.norm(row2)
-    row3 = np.cross(row1, row2)
-    return np.vstack([row1, row2, row3])
-
-
-def _xyz_rot6d_to_homogeneous(xyz_rot6d: np.ndarray) -> np.ndarray:
-    transform = np.eye(4, dtype=np.float64)
-    transform[:3, :3] = _rot6d_to_matrix(xyz_rot6d[3:])
-    transform[:3, 3] = xyz_rot6d[:3]
-    return transform
-
-
-def _homogeneous_to_xyz_rot6d(transform: np.ndarray) -> np.ndarray:
-    return np.concatenate([transform[:3, 3], transform[:2, :3].reshape(-1)], axis=0)
-
-
-def _relative_eef_to_absolute(action: np.ndarray, reference_state: np.ndarray) -> np.ndarray:
-    """Convert relative EEF deltas in xyz+rot6d format to absolute EEF poses."""
-
-    out = np.empty_like(action, dtype=np.float64)
-    for batch_idx in range(action.shape[0]):
-        reference = _xyz_rot6d_to_homogeneous(reference_state[batch_idx])
-        for timestep in range(action.shape[1]):
-            relative = _xyz_rot6d_to_homogeneous(action[batch_idx, timestep])
-            out[batch_idx, timestep] = _homogeneous_to_xyz_rot6d(reference @ relative)
-    return out.astype(np.float32)
-
-
 def _n1_7_action_group_slice(
     action_keys: list[Any], decoded_groups: dict[str, np.ndarray], target_key: str
 ) -> slice:
@@ -1677,7 +1467,7 @@ class GrootN17ActionDecodeStep(ProcessorStep):
             stats_entry = self.raw_stats.get("action", {}).get(key, {})
             if not isinstance(stats_entry, dict):
                 continue
-            dim = _stat_dim_from_entry(stats_entry)
+            dim = stat_dim_from_entry(stats_entry)
             if dim <= 0:
                 continue
             cfg = (
@@ -1716,18 +1506,18 @@ class GrootN17ActionDecodeStep(ProcessorStep):
                 if not isinstance(key, str) or key not in decoded_groups or idx >= len(action_configs):
                     continue
                 cfg = action_configs[idx]
-                if not isinstance(cfg, dict) or _config_value(cfg.get("rep")) != "relative":
+                if not isinstance(cfg, dict) or config_value(cfg.get("rep")) != "relative":
                     continue
                 state_key = cfg.get("state_key") or key
                 if state_key not in raw_state:
                     raise KeyError(f"Missing cached raw state '{state_key}' for relative N1.7 action '{key}'")
                 reference = raw_state[state_key]
-                action_type = _config_value(cfg.get("type"))
-                action_format = _config_value(cfg.get("format"))
+                action_type = config_value(cfg.get("type"))
+                action_format = config_value(cfg.get("format"))
                 if action_type == "non_eef":
                     decoded_groups[key] = decoded_groups[key] + reference[:, None, :]
                 elif action_type == "eef" and action_format == "xyz+rot6d":
-                    decoded_groups[key] = _relative_eef_to_absolute(decoded_groups[key], reference)
+                    decoded_groups[key] = relative_eef_to_absolute(decoded_groups[key], reference)
                 else:
                     raise ValueError(f"Unsupported relative N1.7 action config for '{key}': {cfg}")
 
@@ -1886,15 +1676,27 @@ class GrootActionUnpackUnnormalizeStep(ProcessorStep):
             self.stats = reconstructed
 
 
-def _register_removed_n1_5_step_stub(registry_name: str) -> None:
-    """Register a stub for a processor step that only GR00T N1.5 pipelines serialize.
+# Registry names that only GR00T N1.5 processor pipelines serialize. Saved N1.5 checkpoints
+# reference these in their processor JSON, so deserializing one must fail with the canonical N1.5
+# removal guidance instead of an opaque registry KeyError (or, for
+# ``groot_action_unpack_unnormalize_v1``, silently loading the v2 step whose action-chunk
+# semantics changed).
+_REMOVED_N1_5_STEP_NAMES = (
+    "groot_pack_inputs_v3",
+    "groot_eagle_encode_v3",
+    "groot_eagle_collate_v3",
+    "groot_action_unpack_unnormalize_v1",
+)
 
-    Saved N1.5 checkpoints reference these registry names in their processor JSON
-    files. Deserializing them must fail with the canonical N1.5 removal guidance
-    instead of an opaque registry KeyError (or, for
-    ``groot_action_unpack_unnormalize_v1``, silently loading the v2 step whose
-    action-chunk semantics changed).
+
+def _register_removed_n1_5_step_stub(registry_name: str) -> None:
+    """Register a single rejecting stub for a removed GR00T N1.5 processor step name.
+
+    Idempotent: ``ProcessorStepRegistry.register`` raises on a duplicate name, so already-registered
+    names are skipped. This lets the caller re-run on every processor load without a run-once guard.
     """
+    if registry_name in ProcessorStepRegistry.list():
+        return
 
     @ProcessorStepRegistry.register(name=registry_name)
     class _RemovedGrootN15ProcessorStep(ProcessorStep):
@@ -1911,10 +1713,12 @@ def _register_removed_n1_5_step_stub(registry_name: str) -> None:
             raise NotImplementedError
 
 
-for _removed_n1_5_step_name in (
-    "groot_pack_inputs_v3",
-    "groot_eagle_encode_v3",
-    "groot_eagle_collate_v3",
-    "groot_action_unpack_unnormalize_v1",
-):
-    _register_removed_n1_5_step_stub(_removed_n1_5_step_name)
+def _register_removed_n1_5_step_stubs() -> None:
+    """Register the GR00T N1.5 removal stubs, lazily.
+
+    Deferred from import time so importing this module has no global side effects; invoked just
+    before a GR00T processor pipeline is deserialized (the only point at which a saved N1.5 pipeline
+    could reference these registry names). Idempotent via :func:`_register_removed_n1_5_step_stub`.
+    """
+    for registry_name in _REMOVED_N1_5_STEP_NAMES:
+        _register_removed_n1_5_step_stub(registry_name)

src/lerobot/policies/groot/utils.py

@@ -0,0 +1,256 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Shared, side-effect-free utilities for the GR00T N1.7 policy.
+
+These helpers are consumed by both the config layer (checkpoint sidecar
+inspection) and the processor layer (stat flattening, action decoding, language
+and image packing). They are pure functions with no GR00T-specific state so they
+can be unit-tested in isolation and reused without importing the heavier
+config/processor modules.
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+import numpy as np
+import torch
+
+
+def read_json(path: Path) -> dict[str, Any]:
+    """Read a JSON object from ``path``, returning ``{}`` on any read/parse error."""
+    try:
+        with path.open() as f:
+            data = json.load(f)
+    except (OSError, json.JSONDecodeError):
+        return {}
+    return data if isinstance(data, dict) else {}
+
+
+def as_int_pair(value: Any) -> list[int] | None:
+    if not isinstance(value, (list, tuple)) or len(value) != 2:
+        return None
+    try:
+        return [int(value[0]), int(value[1])]
+    except (TypeError, ValueError):
+        return None
+
+
+def as_optional_int(value: Any) -> int | None:
+    if value is None:
+        return None
+    try:
+        return int(value)
+    except (TypeError, ValueError):
+        return None
+
+
+def as_optional_float(value: Any) -> float | None:
+    if value is None:
+        return None
+    try:
+        return float(value)
+    except (TypeError, ValueError):
+        return None
+
+
+def as_float_list(values: Any) -> list[float]:
+    if values is None:
+        return []
+    if isinstance(values, torch.Tensor):
+        return values.detach().cpu().reshape(-1).float().tolist()
+    if isinstance(values, np.ndarray):
+        return values.reshape(-1).astype(np.float32).tolist()
+    if isinstance(values, (list, tuple)):
+        flattened: list[float] = []
+        for value in values:
+            flattened.extend(as_float_list(value))
+        return flattened
+    return [float(values)]
+
+
+def config_value(value: Any) -> str:
+    if hasattr(value, "value"):
+        value = value.value
+    text = str(value).lower()
+    return {
+        "relative": "relative",
+        "absolute": "absolute",
+        "delta": "delta",
+        "eef": "eef",
+        "non_eef": "non_eef",
+        "default": "default",
+        "xyz_rot6d": "xyz+rot6d",
+        "xyz+rot6d": "xyz+rot6d",
+        "xyz_rotvec": "xyz+rotvec",
+        "xyz+rotvec": "xyz+rotvec",
+    }.get(text, text)
+
+
+def has_modality_stats(stats: dict[str, dict[str, Any]] | None) -> bool:
+    if not stats:
+        return False
+    return any(bool(modality_stats) for modality_stats in stats.values())
+
+
+def stat_dim_from_entry(entry: dict[str, Any]) -> int:
+    for stat_name in ("mean", "q01", "min", "max", "std"):
+        value = entry.get(stat_name)
+        if isinstance(value, list) and len(value) > 0:
+            return len(value)
+    return 0
+
+
+def flatten_n1_7_modality_stats(
+    *,
+    embodiment_stats: dict[str, Any],
+    embodiment_config: dict[str, Any],
+    modality: str,
+    use_percentiles: bool,
+    use_relative_action: bool,
+) -> dict[str, list[float]]:
+    """Flatten one N1.7 modality's grouped statistics in checkpoint order.
+
+    When checkpoints request percentile normalization, q01/q99 replace min/max
+    for regular groups. Relative action groups read from ``relative_action``
+    stats and keep min/max, matching Isaac-GR00T's processor override.
+    """
+
+    source_stats = embodiment_stats.get(modality, {})
+    modality_config = embodiment_config.get(modality, {})
+    if not isinstance(source_stats, dict) or not isinstance(modality_config, dict):
+        return {}
+    modality_keys = modality_config.get("modality_keys", [])
+    if not isinstance(modality_keys, list):
+        return {}
+
+    flattened: dict[str, list[float]] = {}
+    action_configs = modality_config.get("action_configs", []) if modality == "action" else []
+    if not isinstance(action_configs, list):
+        action_configs = []
+    relative_stats = embodiment_stats.get("relative_action", {})
+    if not isinstance(relative_stats, dict):
+        relative_stats = {}
+
+    for stat_name in ("min", "max", "mean", "std"):
+        values: list[float] = []
+        source_stat_name = stat_name
+        if use_percentiles and stat_name == "min":
+            source_stat_name = "q01"
+        elif use_percentiles and stat_name == "max":
+            source_stat_name = "q99"
+
+        for idx, modality_key in enumerate(modality_keys):
+            if not isinstance(modality_key, str):
+                continue
+            key_source_stats = source_stats
+            key_stat_name = source_stat_name
+            if modality == "action" and use_relative_action and idx < len(action_configs):
+                action_config = action_configs[idx]
+                if isinstance(action_config, dict) and config_value(action_config.get("rep")) == "relative":
+                    key_source_stats = relative_stats
+                    key_stat_name = stat_name
+            key_stats = key_source_stats.get(modality_key, {})
+            if not isinstance(key_stats, dict):
+                raise KeyError(f"Missing statistics for {modality}.{modality_key}")
+            raw_values = key_stats.get(key_stat_name)
+            if raw_values is None:
+                raise KeyError(f"Missing '{key_stat_name}' statistics for {modality}.{modality_key}")
+            values.extend(as_float_list(raw_values))
+        if values:
+            flattened[stat_name] = values
+
+    return flattened
+
+
+def rot6d_to_matrix(rot6d: np.ndarray) -> np.ndarray:
+    rows = rot6d.reshape(2, 3).astype(np.float64)
+    row1 = rows[0] / np.linalg.norm(rows[0])
+    row2 = rows[1] - np.dot(row1, rows[1]) * row1
+    row2 = row2 / np.linalg.norm(row2)
+    row3 = np.cross(row1, row2)
+    return np.vstack([row1, row2, row3])
+
+
+def xyz_rot6d_to_homogeneous(xyz_rot6d: np.ndarray) -> np.ndarray:
+    transform = np.eye(4, dtype=np.float64)
+    transform[:3, :3] = rot6d_to_matrix(xyz_rot6d[3:])
+    transform[:3, 3] = xyz_rot6d[:3]
+    return transform
+
+
+def homogeneous_to_xyz_rot6d(transform: np.ndarray) -> np.ndarray:
+    return np.concatenate([transform[:3, 3], transform[:2, :3].reshape(-1)], axis=0)
+
+
+def relative_eef_to_absolute(action: np.ndarray, reference_state: np.ndarray) -> np.ndarray:
+    """Convert relative EEF deltas in xyz+rot6d format to absolute EEF poses."""
+
+    out = np.empty_like(action, dtype=np.float64)
+    for batch_idx in range(action.shape[0]):
+        reference = xyz_rot6d_to_homogeneous(reference_state[batch_idx])
+        for timestep in range(action.shape[1]):
+            relative = xyz_rot6d_to_homogeneous(action[batch_idx, timestep])
+            out[batch_idx, timestep] = homogeneous_to_xyz_rot6d(reference @ relative)
+    return out.astype(np.float32)
+
+
+def infer_n1_7_batch_size_and_device(
+    obs: dict[str, Any], action: torch.Tensor | None
+) -> tuple[int, torch.device]:
+    for value in list(obs.values()) + [action]:
+        if isinstance(value, torch.Tensor):
+            return value.shape[0], value.device
+    video = obs.get("video")
+    if isinstance(video, np.ndarray):
+        return video.shape[0], torch.device("cpu")
+    return 1, torch.device("cpu")
+
+
+def prepare_n1_7_language_batch(
+    language: Any,
+    batch_size: int,
+    *,
+    formalize_language: bool,
+) -> list[str]:
+    default_language = "Perform the task."
+    if language is None or (isinstance(language, str) and language == ""):
+        languages = [default_language] * batch_size
+    elif isinstance(language, str):
+        languages = [language] * batch_size
+    elif isinstance(language, (list, tuple)):
+        languages = list(language)
+        if len(languages) == 0:
+            languages = [default_language] * batch_size
+        elif len(languages) == 1 and batch_size > 1:
+            languages = languages * batch_size
+        elif len(languages) != batch_size:
+            raise ValueError(
+                f"language batch has {len(languages)} entries, but GR00T N1.7 input batch has {batch_size}."
+            )
+    else:
+        languages = [str(language)] * batch_size
+
+    formatted = []
+    for item in languages:
+        text = str(item) if item else default_language
+        if formalize_language:
+            text = text.lower()
+            text = "".join(ch for ch in text if ch.isalnum() or ch.isspace() or ch == "_")
+        formatted.append(text)
+    return formatted

uv.lock

@@ -1464,17 +1464,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/81/47/dd9a212ef6e343a6857485ffe25bba537304f1913bdbed446a23f7f592e1/filelock-3.29.0-py3-none-any.whl", hash = "sha256:96f5f6344709aa1572bbf631c640e4ebeeb519e08da902c39a001882f30ac258", size = 39812, upload-time = "2026-04-19T15:39:08.752Z" },
 ]
 
-[[package]]
-name = "flash-attn"
-version = "2.8.3"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "einops", marker = "platform_machine != 'arm64' or sys_platform != 'darwin'" },
-    { name = "torch", version = "2.11.0", source = { registry = "https://pypi.org/simple" }, marker = "(platform_machine != 'arm64' and sys_platform == 'darwin') or (sys_platform != 'darwin' and sys_platform != 'linux')" },
-    { name = "torch", version = "2.11.0+cu128", source = { registry = "https://download.pytorch.org/whl/cu128" }, marker = "sys_platform == 'linux'" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/3b/b2/8d76c41ad7974ee264754709c22963447f7f8134613fd9ce80984ed0dab7/flash_attn-2.8.3.tar.gz", hash = "sha256:1e71dd64a9e0280e0447b8a0c2541bad4bf6ac65bdeaa2f90e51a9e57de0370d", size = 8447812, upload-time = "2025-08-15T08:28:12.911Z" }
-
 [[package]]
 name = "flatbuffers"
 version = "25.12.19"
@@ -2690,8 +2679,10 @@ all = [
     { name = "contourpy" },
     { name = "datasets" },
     { name = "debugpy" },
+    { name = "decord", marker = "platform_machine == 'AMD64' or platform_machine == 'x86_64'" },
     { name = "deepdiff" },
     { name = "diffusers" },
+    { name = "dm-tree" },
     { name = "dynamixel-sdk" },
     { name = "faker" },
     { name = "fastapi" },
@@ -2739,6 +2730,7 @@ all = [
     { name = "scikit-image" },
     { name = "scipy" },
     { name = "teleop" },
+    { name = "timm" },
     { name = "torchcodec", marker = "(platform_machine == 'arm64' and sys_platform == 'darwin') or (platform_machine == 'AMD64' and sys_platform == 'linux') or (platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'arm64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux') or sys_platform == 'win32'" },
     { name = "torchdiffeq" },
     { name = "transformers" },
@@ -2843,8 +2835,6 @@ groot = [
     { name = "decord", marker = "platform_machine == 'AMD64' or platform_machine == 'x86_64'" },
     { name = "diffusers" },
     { name = "dm-tree" },
-    { name = "flash-attn", marker = "sys_platform != 'darwin'" },
-    { name = "ninja" },
     { name = "peft" },
     { name = "timm" },
     { name = "transformers" },
@@ -3087,7 +3077,6 @@ requires-dist = [
     { name = "faker", marker = "extra == 'sarm'", specifier = ">=33.0.0,<35.0.0" },
     { name = "fastapi", marker = "extra == 'phone'", specifier = "<1.0" },
     { name = "feetech-servo-sdk", marker = "extra == 'feetech'", specifier = ">=1.0.0,<2.0.0" },
-    { name = "flash-attn", marker = "sys_platform != 'darwin' and extra == 'groot'", specifier = ">=2.5.9,<3.0.0" },
     { name = "grpcio", marker = "extra == 'grpcio-dep'", specifier = "==1.73.1" },
     { name = "grpcio-tools", marker = "extra == 'dev'", specifier = "==1.73.1" },
     { name = "gym-aloha", marker = "extra == 'aloha'", specifier = ">=0.1.2,<0.2.0" },
@@ -3132,6 +3121,7 @@ requires-dist = [
     { name = "lerobot", extras = ["feetech"], marker = "extra == 'hopejr'" },
     { name = "lerobot", extras = ["feetech"], marker = "extra == 'lekiwi'" },
     { name = "lerobot", extras = ["gamepad"], marker = "extra == 'all'" },
+    { name = "lerobot", extras = ["groot"], marker = "extra == 'all'" },
     { name = "lerobot", extras = ["grpcio-dep"], marker = "extra == 'async'" },
     { name = "lerobot", extras = ["grpcio-dep"], marker = "extra == 'dev'" },
     { name = "lerobot", extras = ["grpcio-dep"], marker = "extra == 'hilserl'" },
@@ -3224,7 +3214,6 @@ requires-dist = [
     { name = "motorbridge", marker = "extra == 'motorbridge-dep'", specifier = ">=0.3.2,<0.4.0" },
     { name = "motorbridge-smart-servo", marker = "extra == 'motorbridge-smart-servo-dep'", specifier = ">=0.0.4,<0.1.0" },
     { name = "mypy", marker = "extra == 'dev'", specifier = ">=1.19.1" },
-    { name = "ninja", marker = "extra == 'groot'", specifier = ">=1.11.1,<2.0.0" },
     { name = "num2words", marker = "extra == 'smolvla'", specifier = ">=0.5.14,<0.6.0" },
     { name = "numpy", specifier = ">=2.0.0,<2.3.0" },
     { name = "onnx", marker = "extra == 'unitree-g1'", specifier = ">=1.16.0,<2.0.0" },
@@ -4012,32 +4001,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/9e/c9/b2622292ea83fbb4ec318f5b9ab867d0a28ab43c5717bb85b0a5f6b3b0a4/networkx-3.6.1-py3-none-any.whl", hash = "sha256:d47fbf302e7d9cbbb9e2555a0d267983d2aa476bac30e90dfbe5669bd57f3762", size = 2068504, upload-time = "2025-12-08T17:02:38.159Z" },
 ]
 
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