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49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
# Copyright 2019 Deepmind Technologies Limited.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Decoders for rendering images."""
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# pylint: disable=missing-docstring
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from iodine.modules.distributions import MixtureParameters
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import shapeguard
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import sonnet as snt
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class ComponentDecoder(snt.AbstractModule):
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def __init__(self, pixel_decoder, name="component_decoder"):
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super().__init__(name=name)
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self._pixel_decoder = pixel_decoder
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self._sg = shapeguard.ShapeGuard()
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def set_output_shapes(self, pixel, mask):
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self._sg.guard(pixel, "K, H, W, Cp")
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self._sg.guard(mask, "K, H, W, 1")
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self._pixel_decoder.set_output_shapes(self._sg["H, W, 1 + Cp"])
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def _build(self, z):
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self._sg.guard(z, "B, K, Z")
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z_flat = self._sg.reshape(z, "B*K, Z")
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pixel_params = self._pixel_decoder(z_flat).params
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self._sg.guard(pixel_params, "B*K, H, W, 1 + Cp")
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mask_params = pixel_params[..., 0:1]
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pixel_params = pixel_params[..., 1:]
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output = MixtureParameters(
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pixel=self._sg.reshape(pixel_params, "B, K, H, W, Cp"),
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mask=self._sg.reshape(mask_params, "B, K, H, W, 1"),
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)
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del self._sg.B
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return output
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