Source code for

# Copyright 2018, 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
# or in the "license" file accompanying this file. This file is distributed
# express or implied. See the License for the specific language governing
# permissions and limitations under the License.

from typing import List, Optional, Tuple

import mxnet as mx
import numpy as np

from gluonts.core.component import validated
from gluonts.dataset.common import Dataset
from import Tensor
from import get_mxnet_context

from .representation import Representation

[docs]class RepresentationChain(Representation): """ A class representing a hybrid approach of combining multiple representations into a single representation. Representations will be combined by concatenating them on dim=-1. Parameters ---------- chain A list of representations. Elements must be of type Representation. """ @validated() def __init__(self, chain: List, *args, **kwargs): super().__init__(*args, **kwargs) self.chain = chain for representation in self.chain: self.register_child(representation)
[docs] def initialize_from_dataset( self, input_dataset: Dataset, ctx: mx.Context = get_mxnet_context() ): for representation in self.chain: representation.initialize_from_dataset(input_dataset, ctx)
[docs] def initialize_from_array( self, input_array: np.ndarray, ctx: mx.Context = get_mxnet_context() ): for representation in self.chain: representation.initialize_from_array(input_array, ctx)
# noinspection PyMethodOverriding
[docs] def hybrid_forward( self, F, data: Tensor, observed_indicator: Tensor, scale: Optional[Tensor], rep_params: List[Tensor], **kwargs, ) -> Tuple[Tensor, Tensor, List[Tensor]]: for representation in self.chain: data, scale, rep_params = representation( data, observed_indicator, scale, rep_params, ) return data, scale, rep_params
[docs] def post_transform( self, F, samples: Tensor, scale: Tensor, rep_params: List[Tensor] ) -> Tensor: for representation in self.chain[::-1]: samples = representation.post_transform( F, samples, scale, rep_params, ) return samples