[Refactor] Use compile-aware helpers in Dreamer objectives

[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

---

• Replace timeit with _maybe_timeit
• Add _maybe_record_function_decorator to loss forward methods
• Use .data and .copy() instead of .detach() and .clone(recurse=False)
• Ensure contiguous layout for tensor operations

[pytorch-bot]

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❌ 2 New Failures, 23 Pending

As of commit c43c840 with merge base df00d61 ():

NEW FAILURES - The following jobs have failed:

• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 2f8a45a263d210af86c4fa0420bccb3b173ddb3ad21dca771cfe3e7e577429fc /exec failed with exit code 1
• Lint / python-source-and-configs / linux-job (gh)
  RuntimeError: Command docker exec -t c634cab9bcc2ed4fbd4be9e255868dcbdb6daf43e5dee9558dc61f5944475b6c /exec failed with exit code 1

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