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Warn when output shape not specified for Lambda on Theano #4543

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merged 1 commit into from Dec 1, 2016
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Warn when output shape not specified for Lambda on Theano #4543

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5 changes: 5 additions & 0 deletions keras/layers/core.py
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Expand Up @@ -566,6 +566,11 @@ def get_output_shape_for(self, input_shape):
else:
return K.int_shape(x)
# otherwise, we default to the input shape
warnings.warn('`output_shape` argument not specified for layer {} '
'and cannot be automatically inferred with the Theano backend. '
'Defaulting to output shape `{}` (same as input shape). '
'If the expected output shape is different, specify it via the `output_shape` argument.'
.format(self.name, input_shape))
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For consistency with the rest of the file, use ' instead of " to format strings.

return input_shape
elif type(self._output_shape) in {tuple, list}:
if type(input_shape) is list:
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