RenameTransform¶
- class torchrl.envs.transforms.RenameTransform(in_keys, out_keys, in_keys_inv=None, out_keys_inv=None, create_copy=False)[原始碼]¶
一個用於重新命名輸出tensordict(或透過反向鍵重新命名輸入tensordict)的轉換。
- 引數:
in_keys (sequence of NestedKey) – 要重新命名的條目。
out_keys (sequence of NestedKey) – 重新命名後的條目名稱。
in_keys_inv (sequence of NestedKey, optional) – 在輸入tensordict中要重新命名的條目,這些條目將傳遞給
EnvBase._step()。out_keys_inv (sequence of NestedKey, optional) – 重新命名後輸入tensordict中的條目名稱。
create_copy (bool, optional) – 如果為
True,條目將被複制並賦予不同的名稱,而不是被重新命名。這允許重新命名不可變的條目,例如"reward"和"done"。
示例
>>> from torchrl.envs.libs.gym import GymEnv >>> env = TransformedEnv( ... GymEnv("Pendulum-v1"), ... RenameTransform(["observation", ], ["stuff",], create_copy=False), ... ) >>> tensordict = env.rollout(3) >>> print(tensordict) TensorDict( fields={ action: Tensor(shape=torch.Size([3, 1]), device=cpu, dtype=torch.float32, is_shared=False), done: Tensor(shape=torch.Size([3, 1]), device=cpu, dtype=torch.bool, is_shared=False), next: TensorDict( fields={ done: Tensor(shape=torch.Size([3, 1]), device=cpu, dtype=torch.bool, is_shared=False), reward: Tensor(shape=torch.Size([3, 1]), device=cpu, dtype=torch.float32, is_shared=False), stuff: Tensor(shape=torch.Size([3, 3]), device=cpu, dtype=torch.float32, is_shared=False)}, batch_size=torch.Size([3]), device=cpu, is_shared=False), stuff: Tensor(shape=torch.Size([3, 3]), device=cpu, dtype=torch.float32, is_shared=False)}, batch_size=torch.Size([3]), device=cpu, is_shared=False) >>> # if the output is also an input, we need to rename if both ways: >>> from torchrl.envs.libs.brax import BraxEnv >>> env = TransformedEnv( ... BraxEnv("fast"), ... RenameTransform(["state"], ["newname"], ["state"], ["newname"]) ... ) >>> _ = env.set_seed(1) >>> tensordict = env.rollout(3) >>> assert "newname" in tensordict.keys() >>> assert "state" not in tensordict.keys()
- forward(next_tensordict: TensorDictBase) TensorDictBase¶
讀取輸入 tensordict,並對選定的鍵應用轉換。
預設情況下,此方法
直接呼叫
_apply_transform()。不呼叫
_step()或_call()。
此方法不會在任何時候在 env.step 中呼叫。但是,它會在
sample()中呼叫。注意
forward也可以使用dispatch將引數名稱轉換為鍵,並使用常規關鍵字引數。示例
>>> class TransformThatMeasuresBytes(Transform): ... '''Measures the number of bytes in the tensordict, and writes it under `"bytes"`.''' ... def __init__(self): ... super().__init__(in_keys=[], out_keys=["bytes"]) ... ... def forward(self, tensordict: TensorDictBase) -> TensorDictBase: ... bytes_in_td = tensordict.bytes() ... tensordict["bytes"] = bytes ... return tensordict >>> t = TransformThatMeasuresBytes() >>> env = env.append_transform(t) # works within envs >>> t(TensorDict(a=0)) # Works offline too.
- transform_input_spec(input_spec: Composite) Composite[原始碼]¶
轉換輸入規範,使結果規範與轉換對映匹配。
- 引數:
input_spec (TensorSpec) – 轉換前的規範
- 返回:
轉換後的預期規範