[WIP] Added pred-continue and collector-mask for dreamer

[FrankTianTT]

Description

Added optional pred-continue function like https://github.com/danijar/dreamer/blob/master/dreamer.py#L187C32-L187C32, and using collector-mask to remove empty data.

Motivation and Context

To make sure dreamer can work on early-stop env.

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Remove all that do not apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of examples)

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/1704

• 📄 Preview Python docs built from this PR

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✅ You can merge normally! (17 Unrelated Failures)

As of commit b5a4a88 with merge base 44bd026 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Process completed with exit code 134.
• Examples Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 0f2a1b399ade6c93073fff9ad29d89761f11e25b0ec6a8f66a154c8ea035f4e0 /exec failed with exit code 1
• Lint / python-source-and-configs / linux-job (gh)
  torchrl/trainers/helpers/models.py:62:1: F401 'torchrl.modules.tensordict_module.world_models.WorldModelWrapper' imported but unused
• Olddeps Tests on Linux / unittests (3.8, 11.6) / linux-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Optdeps Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Unit-tests on Linux CPU / tests (3.10) / linux-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Unit-tests on Linux CPU / tests (3.11) / linux-job (gh)
  test/test_libs.py::TestGym::test_vecenvs_env[CartPole-v1]
• Unit-tests on Linux CPU / tests (3.8) / linux-job (gh)
  test/test_libs.py::TestGym::test_vecenvs_env[CartPole-v1]
• Unit-tests on Linux CPU / tests (3.9) / linux-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Unit-tests on Linux GPU / tests (3.8, 12.1) / linux-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Unit-tests on Linux GPU, latest stable release / tests (3.8, 11.8) / linux-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Unit-tests on MacOS CPU / tests (3.11) / macos-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Unit-tests on MacOS CPU / tests (3.8) / macos-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Unit-tests on Windows / unittests-cpu / windows-job (gh)
  test/test_cost.py::TestDreamer::test_dreamer_actor_tensordict_keys[ValueEstimators.TDLambda-device0]
• Unit-tests on Windows / unittests-gpu / windows-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Habitat Tests on Linux / tests (3.9, 11.6) / linux-job (gh)
  test/test_libs.py::TestHabitat::test_habitat_render[False-HabitatPick-v0]

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