# Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# or in the "license" file accompanying this file. This file is distributed
# on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
# express or implied. See the License for the specific language governing
# permissions and limitations under the License.
from typing import List, Optional, Tuple
from gluonts.core.component import validated
from gluonts.mx import Tensor
from .representation import Representation
[docs]class DimExpansion(Representation):
"""
A class representing a dimension expansion operation along a specified
axis.
Parameters
----------
axis
Axis on which to expand the tensor.
(default: -1)
"""
@validated()
def __init__(self, axis: int = -1, *args, **kwargs):
super().__init__(*args, **kwargs)
self.axis = axis
[docs] def hybrid_forward(
self,
F,
data: Tensor,
observed_indicator: Tensor,
scale: Optional[Tensor],
rep_params: List[Tensor],
**kwargs,
) -> Tuple[Tensor, Tensor, List[Tensor]]:
data = F.expand_dims(data, axis=self.axis)
return data, scale, rep_params