feat(ci): extract task descriptions and embed in metrics artifact

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/benchmark_tests.yml

@@ -128,6 +128,9 @@ jobs:
                 '--env.camera_name_mapping={\"agentview_image\": \"camera1\", \"robot0_eye_in_hand_image\": \"camera2\"}' \
                 --policy.empty_cameras=1 \
                 --output_dir=/tmp/eval-artifacts
+              python3 /lerobot/scripts/ci/extract_task_descriptions.py \
+                --env libero --task libero_spatial \
+                --output /tmp/eval-artifacts/task_descriptions.json 2>/dev/null || true
             "
 
       - name: Copy Libero artifacts from container
@@ -162,6 +165,60 @@ jobs:
           path: /tmp/libero-artifacts/metrics.json
           if-no-files-found: warn
 
+      # ── LIBERO TRAIN+EVAL SMOKE ──────────────────────────────────────────────
+      # Train SmolVLA for 1 step (batch_size=1, dataset episode 0 only) then
+      # immediately runs eval inside the training loop (eval_freq=1, 1 episode).
+      # Tests the full train→eval-within-training pipeline end-to-end.
+      - name: Run Libero train+eval smoke (1 step, eval_freq=1)
+        run: |
+          docker run --name libero-train-smoke --gpus all \
+            --shm-size=4g \
+            -e HF_HOME=/tmp/hf \
+            -e HF_USER_TOKEN="${HF_USER_TOKEN}" \
+            -e HF_HUB_DOWNLOAD_TIMEOUT=300 \
+            lerobot-benchmark-libero:ci \
+            bash -c "
+              hf auth login --token \"\$HF_USER_TOKEN\" --add-to-git-credential 2>/dev/null || true
+              accelerate launch --num_processes=1 \$(which lerobot-train) \
+                --policy.path=lerobot/smolvla_base \
+                --policy.load_vlm_weights=true \
+                --policy.scheduler_decay_steps=25000 \
+                --policy.freeze_vision_encoder=false \
+                --policy.train_expert_only=false \
+                --dataset.repo_id=lerobot/libero \
+                --dataset.episodes=[0] \
+                --dataset.use_imagenet_stats=false \
+                --env.type=libero \
+                --env.task=libero_spatial \
+                '--env.camera_name_mapping={\"agentview_image\": \"camera1\", \"robot0_eye_in_hand_image\": \"camera2\"}' \
+                --policy.empty_cameras=1 \
+                --output_dir=/tmp/train-smoke \
+                --steps=1 \
+                --batch_size=1 \
+                --eval_freq=1 \
+                --eval.n_episodes=1 \
+                --eval.batch_size=1 \
+                --eval.use_async_envs=false \
+                --save_freq=1 \
+                --policy.push_to_hub=false \
+                '--rename_map={\"observation.images.image\": \"observation.images.camera1\", \"observation.images.image2\": \"observation.images.camera2\"}'
+            "
+
+      - name: Copy Libero train-smoke artifacts from container
+        if: always()
+        run: |
+          mkdir -p /tmp/libero-train-smoke-artifacts
+          docker cp libero-train-smoke:/tmp/train-smoke/. /tmp/libero-train-smoke-artifacts/ 2>/dev/null || true
+          docker rm -f libero-train-smoke || true
+
+      - name: Upload Libero train-smoke eval video
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: libero-train-smoke-video
+          path: /tmp/libero-train-smoke-artifacts/eval/
+          if-no-files-found: warn
+
   # ── METAWORLD ─────────────────────────────────────────────────────────────
   # Isolated image: lerobot[metaworld] only (metaworld==3.0.0, mujoco>=3 chain)
   metaworld-integration-test:
@@ -214,6 +271,9 @@ jobs:
                 '--rename_map={\"observation.image\": \"observation.images.camera1\"}' \
                 --policy.empty_cameras=2 \
                 --output_dir=/tmp/eval-artifacts
+              python3 /lerobot/scripts/ci/extract_task_descriptions.py \
+                --env metaworld --task metaworld-push-v3 \
+                --output /tmp/eval-artifacts/task_descriptions.json 2>/dev/null || true
             "
 
       - name: Copy MetaWorld artifacts from container

scripts/ci/extract_task_descriptions.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+# Copyright 2025 The HuggingFace Inc. team. All rights reserved.
+#
+# 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.
+
+"""Extract natural-language task descriptions for a benchmark suite.
+
+Runs inside the benchmark Docker container (where the env library is installed)
+immediately after lerobot-eval, writing a JSON file that parse_eval_metrics.py
+picks up and embeds in metrics.json.
+
+Output format: {"<suite>_<task_idx>": "<nl instruction>", ...}
+
+Usage:
+    python scripts/ci/extract_task_descriptions.py \\
+        --env libero --task libero_spatial \\
+        --output /tmp/eval-artifacts/task_descriptions.json
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import sys
+from pathlib import Path
+
+
+def _libero_descriptions(task_suite: str) -> dict[str, str]:
+    from libero.libero import benchmark  # type: ignore[import-untyped]
+
+    suite_dict = benchmark.get_benchmark_dict()
+    if task_suite not in suite_dict:
+        print(
+            f"[extract_task_descriptions] Unknown LIBERO suite '{task_suite}'. "
+            f"Available: {list(suite_dict.keys())}",
+            file=sys.stderr,
+        )
+        return {}
+    suite = suite_dict[task_suite]()
+    return {f"{task_suite}_{i}": suite.get_task(i).language for i in range(suite.n_tasks)}
+
+
+def _metaworld_descriptions(task_name: str) -> dict[str, str]:
+    # MetaWorld tasks don't expose a separate NL description attribute;
+    # use a cleaned version of the task name as the description.
+    label = task_name.removeprefix("metaworld-").replace("-", " ").strip()
+    return {f"{task_name}_0": label}
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--env", required=True, help="Environment family (libero, metaworld, ...)")
+    parser.add_argument("--task", required=True, help="Task/suite name (e.g. libero_spatial)")
+    parser.add_argument("--output", required=True, help="Path to write task_descriptions.json")
+    args = parser.parse_args()
+
+    descriptions: dict[str, str] = {}
+    try:
+        if args.env == "libero":
+            descriptions = _libero_descriptions(args.task)
+        elif args.env == "metaworld":
+            descriptions = _metaworld_descriptions(args.task)
+        else:
+            print(
+                f"[extract_task_descriptions] No description extractor for env '{args.env}'.",
+                file=sys.stderr,
+            )
+    except Exception as exc:
+        print(f"[extract_task_descriptions] Warning: {exc}", file=sys.stderr)
+
+    out_path = Path(args.output)
+    out_path.parent.mkdir(parents=True, exist_ok=True)
+    out_path.write_text(json.dumps(descriptions, indent=2))
+    print(f"[extract_task_descriptions] {len(descriptions)} descriptions → {out_path}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

scripts/ci/parse_eval_metrics.py

@@ -39,30 +39,30 @@ import sys
 from pathlib import Path
 
 
-def _extract_pc_success(info: dict) -> tuple[float | None, int | None]:
+def _extract_metrics(info: dict) -> tuple[float | None, int | None, float | None, float | None]:
-    """Extract (pc_success, n_episodes) from eval_info.json.
+    """Extract (pc_success, n_episodes, avg_sum_reward, eval_s) from eval_info.json.
 
     Handles two output shapes:
       - Single-task: {"aggregated": {"pc_success": 80.0, ...}}
       - Multi-task:  {"overall": {"pc_success": 80.0, "n_episodes": 5, ...}}
     """
-    # Single-task path
+    for key in ("aggregated", "overall"):
-    if "aggregated" in info:
+        if key not in info:
-        agg = info["aggregated"]
+            continue
+        agg = info[key]
         pc = agg.get("pc_success")
-        n = agg.get("n_episodes")  # may be absent in older format
+        n = agg.get("n_episodes")
+        reward = agg.get("avg_sum_reward")
+        eval_s = agg.get("eval_s")
         if pc is not None and not math.isnan(pc):
-            return float(pc), int(n) if n is not None else None
+            return (
+                float(pc),
+                int(n) if n is not None else None,
+                float(reward) if reward is not None else None,
+                float(eval_s) if eval_s is not None else None,
+            )
 
-    # Multi-task path
+    return None, None, None, None
-    if "overall" in info:
-        overall = info["overall"]
-        pc = overall.get("pc_success")
-        n = overall.get("n_episodes")
-        if pc is not None and not math.isnan(pc):
-            return float(pc), int(n) if n is not None else None
-
-    return None, None
 
 
 def main() -> int:
@@ -80,11 +80,13 @@ def main() -> int:
 
     pc_success: float | None = None
     n_episodes: int | None = None
+    avg_sum_reward: float | None = None
+    eval_s: float | None = None
 
     if eval_info_path.exists():
         try:
             info = json.loads(eval_info_path.read_text())
-            pc_success, n_episodes = _extract_pc_success(info)
+            pc_success, n_episodes, avg_sum_reward, eval_s = _extract_metrics(info)
         except (json.JSONDecodeError, KeyError, TypeError) as exc:
             print(f"[parse_eval_metrics] Warning: could not parse eval_info.json: {exc}", file=sys.stderr)
     else:
@@ -93,12 +95,26 @@ def main() -> int:
             file=sys.stderr,
         )
 
+    task_descriptions: dict[str, str] = {}
+    task_desc_path = artifacts_dir / "task_descriptions.json"
+    if task_desc_path.exists():
+        try:
+            task_descriptions = json.loads(task_desc_path.read_text())
+        except json.JSONDecodeError as exc:
+            print(
+                f"[parse_eval_metrics] Warning: could not parse task_descriptions.json: {exc}",
+                file=sys.stderr,
+            )
+
     metrics = {
         "env": args.env,
         "task": args.task,
         "policy": args.policy,
         "pc_success": pc_success,
         "n_episodes": n_episodes,
+        "avg_sum_reward": avg_sum_reward,
+        "eval_s": eval_s,
+        "task_descriptions": task_descriptions,
     }
 
     out_path = artifacts_dir / "metrics.json"