[BugFix] Fix value functions for torch.compile compatibility

[vmoens]

Stack from ghstack (oldest at bottom):

• [Feature] Add _Contiguous module and reshape improvements to encoders/decoders #3306
• [BugFix] Fix SliceSampler for torch.compile compatibility #3298
• [Feature] Refactor Dreamer training with async collectors, profiling, and improved config #3308
• [Feature] Add noise argument and scan mode to RSSMRollout #3307
• [Feature] Add explicit dimensions and device support to RSSM modules #3305
• [Refactor] Use compile-aware helpers in Dreamer objectives #3304
• -> [BugFix] Fix value functions for torch.compile compatibility #3303
• [BugFix] Fix TDLambdaEstimator for torch.compile compatibility #3302
• [BugFix] Optimize DreamerEnv to avoid CUDA sync in done checks #3301
• [Feature] Add allow_done_after_reset parameter to ModelBasedEnvBase #3300
• [BugFix] Fix ModelBasedEnvBase for torch.compile compatibility #3299
• [Refactor] Add compile-aware timing and profiling helpers #3297
• [Feature] Support callable scale in IndependentNormal and TanhNormal distributions #3296
• [Refactor] Use non_blocking transfers in distribution modules #3295
• [Refactor] Add WEIGHT_SYNC_TIMEOUT constant for collector weight synchronization #3294
• [Refactor] Remove MUJOCO_EGL_DEVICE_ID auto-setting from torchrl init #3293

---

• Skip data-dependent truncation in vec_generalized_advantage_estimate during compile
• Use expand instead of full_like to avoid .item() calls with unbacked symbols
• Use torch.full(..., device=device) to avoid DeviceCopy in cudagraph
• Skip validation during compile to avoid CUDA syncs

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/3303

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure, 23 Pending

As of commit 1c724c3 with merge base df00d61 ():

NEW FAILURE - The following job has failed:

• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 6278fc702acaaa598015aad3e33e2f7977792a52467d85267c8b81656a6831d7 /exec failed with exit code 1

This comment was automatically generated by Dr. CI and updates every 15 minutes.