49 lines
1.7 KiB
Python
49 lines
1.7 KiB
Python
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# Copyright 2016 The TensorFlow Authors. All Rights Reserved.
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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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# ==============================================================================
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"""Converts assert statements to their corresponding TF calls."""
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import gast
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from tensorflow.python.autograph.core import converter
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from tensorflow.python.autograph.pyct import templates
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class AssertTransformer(converter.Base):
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"""Transforms Assert nodes to Call so they can be handled as functions."""
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def visit_Assert(self, node):
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self.generic_visit(node)
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# Note: The lone tf.Assert call will be wrapped with control_dependencies
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# by side_effect_guards.
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template = """
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ag__.assert_stmt(test, lambda: msg)
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"""
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if node.msg is None:
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return templates.replace(
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template,
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test=node.test,
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msg=gast.Constant('Assertion error', kind=None))
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elif isinstance(node.msg, gast.Constant):
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return templates.replace(template, test=node.test, msg=node.msg)
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else:
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raise NotImplementedError('can only convert string messages for now.')
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def transform(node, ctx):
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node = AssertTransformer(ctx).visit(node)
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return node
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