fix(profiling): address review feedback

.github/workflows/model_profiling.yml

@@ -20,7 +20,6 @@ on:
   pull_request:
     branches:
       - main
-      - feat/libero-benchmark
     paths:
       - .github/workflows/model_profiling.yml
       - src/lerobot/configs/train.py

src/lerobot/configs/train.py

@@ -16,7 +16,7 @@ import datetime as dt
 import os
 from dataclasses import dataclass, field
 from pathlib import Path
-from typing import Any
+from typing import Any, Literal
 
 import draccus
 from huggingface_hub import hf_hub_download
@@ -58,7 +58,7 @@ class TrainPipelineConfig(HubMixin):
     batch_size: int = 8
     prefetch_factor: int = 4
     persistent_workers: bool = True
-    profile_mode: str = "off"
+    profile_mode: Literal["off", "summary", "trace"] = "off"
     profile_output_dir: Path | None = None
     steps: int = 100_000
     eval_freq: int = 20_000

src/lerobot/utils/model_profiling.py

@@ -33,7 +33,6 @@ Usage (CI):
 from __future__ import annotations
 
 import argparse
-import contextlib
 import hashlib
 import json
 import logging
@@ -53,7 +52,7 @@ from typing import Any
 import torch
 from huggingface_hub import CommitOperationAdd, HfApi
 from huggingface_hub.errors import HfHubHTTPError
-from torch.utils.data._utils.collate import default_collate
+from torch.utils.data import default_collate
 
 logger = logging.getLogger(__name__)
 
@@ -305,11 +304,10 @@ def _get_profiler_device_time_us(event: Any) -> float | None:
 
 
 def _write_profiler_table(profiler: Any, path: Path, *, sort_by: str, row_limit: int = 40) -> None:
-    # The profiler may not have recorded any events for this sort key when the
+    try:
-    # schedule window lands outside the active steps — skip silently rather
-    # than crashing the whole artifact-writer pass.
-    with contextlib.suppress(Exception):
         path.write_text(profiler.key_averages().table(sort_by=sort_by, row_limit=row_limit))
+    except Exception:
+        logger.debug("Could not write profiler table for sort_by=%s", sort_by, exc_info=True)
 
 
 def write_deterministic_forward_artifacts(
@@ -324,7 +322,9 @@ def write_deterministic_forward_artifacts(
     """Run a seed-controlled single forward pass and dump a stable fingerprint
     (loss/output tensor hashes + op counts) for regression detection. Keeps
     the caller-selected module mode so ACT-with-VAE-style policies that only
-    materialize their full forward outputs in `train()` still match."""
+    materialize their full forward outputs in `train()` still match. Models
+    with stochastic train-mode layers still rely on the seeded RNG for stable
+    fingerprints."""
     if len(dataset) == 0:
         raise ValueError("Cannot build a reference batch from an empty dataset.")
     indices = [i % len(dataset) for i in range(batch_size)]
@@ -701,9 +701,12 @@ def main() -> int:
 
     args.output_dir.mkdir(parents=True, exist_ok=True)
     repo_id = args.results_repo if "/" in args.results_repo else f"{args.hub_org}/{args.results_repo}"
-    git_exe = shutil.which("git") or (_ for _ in ()).throw(RuntimeError("git not found in PATH"))
+    git_exe = shutil.which("git")
+    if not git_exe:
+        raise RuntimeError("git not found in PATH")
     git_commit = args.git_commit or subprocess.check_output([git_exe, "rev-parse", "HEAD"], text=True).strip()
     pr_number = int(args.pr_number) if str(args.pr_number).strip() else None
+    exit_code = 0
 
     for policy in selected:
         run_id = f"{_utc_timestamp_slug()}__{policy}"
@@ -717,6 +720,8 @@ def main() -> int:
 
         (run_dir / "stdout.txt").write_text(result.stdout)
         (run_dir / "stderr.txt").write_text(result.stderr)
+        if result.returncode != 0:
+            exit_code = 1
 
         paths, urls, upload_list, row_in_repo = build_artifact_index(
             repo_id=repo_id, run_dir=run_dir, policy_name=policy, run_id=run_id
@@ -771,7 +776,7 @@ def main() -> int:
 
         print(json.dumps(row, indent=2, sort_keys=True))
 
-    return 0
+    return exit_code
 
 
 if __name__ == "__main__":

tests/test_model_profiling.py

@@ -156,7 +156,7 @@ def test_parse_discussion_num_handles_hf_discussion_urls():
 
 
 @pytest.fixture
-def _fake_args(tmp_path):
+def fake_args(tmp_path):
     """Shared argparse namespace for main() smoke tests — overridden per-test."""
     return argparse.Namespace(
         policies=["act"],
@@ -195,14 +195,14 @@ def _stub_train_subprocess(mp_module, *, returncode: int = 0, write_artifacts: b
     return _fake_run
 
 
-def test_main_smoke_writes_row(monkeypatch, _fake_args):
+def test_main_smoke_writes_row(monkeypatch, fake_args):
-    monkeypatch.setattr(mp, "parse_args", lambda: _fake_args)
+    monkeypatch.setattr(mp, "parse_args", lambda: fake_args)
     monkeypatch.setattr(mp.subprocess, "check_output", lambda *a, **k: "deadbeef\n")
     monkeypatch.setattr(mp.subprocess, "run", _stub_train_subprocess(mp))
 
     assert mp.main() == 0
 
-    row_paths = list(_fake_args.output_dir.rglob("profiling_row.json"))
+    row_paths = list(fake_args.output_dir.rglob("profiling_row.json"))
     assert len(row_paths) == 1
     row = json.loads(row_paths[0].read_text())
     assert row["policy"] == "act"
@@ -214,10 +214,10 @@ def test_main_smoke_writes_row(monkeypatch, _fake_args):
     assert row["deterministic_forward"]["operator_fingerprint"] == "ops-fingerprint"
 
 
-def test_main_records_publish_failure_without_failing(monkeypatch, _fake_args):
+def test_main_records_publish_failure_without_failing(monkeypatch, fake_args):
-    _fake_args.publish = True
+    fake_args.publish = True
-    _fake_args.git_commit = "deadbeef"
+    fake_args.git_commit = "deadbeef"
-    monkeypatch.setattr(mp, "parse_args", lambda: _fake_args)
+    monkeypatch.setattr(mp, "parse_args", lambda: fake_args)
     monkeypatch.setattr(mp.subprocess, "run", _stub_train_subprocess(mp, write_artifacts=False))
 
     def _fail_upload(**kwargs):
@@ -227,12 +227,24 @@ def test_main_records_publish_failure_without_failing(monkeypatch, _fake_args):
     monkeypatch.setattr(mp, "upload_profile_run", _fail_upload)
 
     assert mp.main() == 0
-    row = json.loads(next(_fake_args.output_dir.rglob("profiling_row.json")).read_text())
+    row = json.loads(next(fake_args.output_dir.rglob("profiling_row.json")).read_text())
     assert row["status"] == "success"
     assert row["publish_status"] == "failed"
     assert "Authorization error" in row["publish_error"]
 
 
+def test_main_returns_nonzero_when_training_subprocess_fails(monkeypatch, fake_args):
+    monkeypatch.setattr(mp, "parse_args", lambda: fake_args)
+    monkeypatch.setattr(mp.subprocess, "check_output", lambda *a, **k: "deadbeef\n")
+    monkeypatch.setattr(mp.subprocess, "run", _stub_train_subprocess(mp, returncode=3))
+
+    assert mp.main() == 1
+
+    row = json.loads(next(fake_args.output_dir.rglob("profiling_row.json")).read_text())
+    assert row["status"] == "failed"
+    assert row["return_code"] == 3
+
+
 # ---------------------------------------------------------------------------
 # TrainingProfiler behavior
 # ---------------------------------------------------------------------------