d3rlpy.preprocessing.StandardScaler¶
-
class
d3rlpy.preprocessing.
StandardScaler
(dataset=None, mean=None, std=None)[source]¶ Standardization preprocessing.
\[x' = (x - \mu) / \sigma\]from d3rlpy.dataset import MDPDataset from d3rlpy.algos import CQL dataset = MDPDataset(observations, actions, rewards, terminals) # initialize algorithm with StandardScaler cql = CQL(scaler='standard') # scaler is initialized from the given episodes cql.fit(dataset.episodes)
You can initialize with
d3rlpy.dataset.MDPDataset
object or manually.from d3rlpy.preprocessing import StandardScaler # initialize with dataset scaler = StandardScaler(dataset) # initialize manually mean = observations.mean(axis=0) std = observations.std(axis=0) scaler = StandardScaler(mean=mean, std=std) cql = CQL(scaler=scaler)
- Parameters
dataset (d3rlpy.dataset.MDPDataset) – dataset object.
mean (numpy.ndarray) – mean values at each entry.
std (numpy.ndarray) – standard deviation at each entry.
Methods
-
fit
(episodes)[source]¶ Fits mean and standard deviation from list of episodes.
- Parameters
episodes (List[d3rlpy.dataset.Episode]) – list of episodes.
- Return type
-
reverse_transform
(x)[source]¶ Returns reversely transformed observation tensor.
- Parameters
x (torch.Tensor) – standardized observation tensor.
- Returns
unstandardized observation tensor.
- Return type
torch.Tensor
-
transform
(x)[source]¶ Returns standardized observation tensor.
- Parameters
x (torch.Tensor) – observation tensor.
- Returns
standardized observation tensor.
- Return type
torch.Tensor
Attributes