Source code for rlgraph.components.layers.preprocessing.preprocess_layer
# Copyright 2018 The RLgraph authors. All Rights Reserved.
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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
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# ==============================================================================
from __future__ import absolute_import
from __future__ import print_function
from __future__ import division
from rlgraph import get_backend
from rlgraph.components.layers import Layer
from rlgraph.utils.util import default_dict
from rlgraph.utils.decorators import rlgraph_api
if get_backend() == "tf":
import tensorflow as tf
[docs]class PreprocessLayer(Layer):
"""
A Layer that - additionally to `apply` - implements the `reset` API-method.
`apply` is usually used for preprocessing inputs. `reset` is used to reset some state information of this
preprocessor (e.g reset/reinitialize a variable).
"""
def __init__(self, scope="pre-process", **kwargs):
super(PreprocessLayer, self).__init__(scope=scope, **kwargs)
@rlgraph_api
def _graph_fn_reset(self):
"""
Does some reset operations e.g. in case this PreprocessLayer contains variables and state.
Returns:
SingleDataOp: The op that resets this processor to some initial state.
"""
if get_backend() == "tf":
return tf.no_op(name="reset-op") # Not mandatory.
# TODO: fix for python backend.
return
@rlgraph_api(flatten_ops=True, split_ops=True)
def _graph_fn_apply(self, *preprocessing_inputs):
return super(PreprocessLayer, self)._graph_fn_apply(*preprocessing_inputs)