#
# Copyright (c) 2017 Intel Corporation
#
# 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
#
# 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
# limitations under the License.
#
import numpy as np
from rl_coach.core_types import ObservationType
from rl_coach.filters.observation.observation_filter import ObservationFilter
from rl_coach.spaces import ObservationSpace
[docs]class ObservationSqueezeFilter(ObservationFilter):
"""
Removes redundant axes from the observation, which are axes with a dimension of 1.
"""
def __init__(self, axis: int = None):
"""
:param axis: Specifies which axis to remove. If set to None, all the axes of size 1 will be removed.
"""
super().__init__()
self.axis = axis
def validate_input_observation_space(self, input_observation_space: ObservationSpace):
if self.axis is None:
return
shape = input_observation_space.shape
if self.axis >= len(shape) or self.axis < -len(shape):
raise ValueError("The given axis does not exist in the context of the input observation shape. ")
def filter(self, observation: ObservationType, update_internal_state: bool=True) -> ObservationType:
return observation.squeeze(axis=self.axis)
def get_filtered_observation_space(self, input_observation_space: ObservationSpace) -> ObservationSpace:
dummy_tensor = np.random.rand(*tuple(input_observation_space.shape))
input_observation_space.shape = dummy_tensor.squeeze(axis=self.axis).shape
return input_observation_space