57612707c1434ed3b18f9cad5cf2e6dd8b7b3b7d,keras/layers/core.py,Merge,__init__,#Merge#Any#Any#Any#Any#,279

Before Change

                    if shape1[dot_axes[0][i]] != shape2[dot_axes[1][i]]:
                        raise Exception(" Dot incompatible layers can not be merged using dot mode")
        elif mode == "concat":
            input_shapes = set([list(l.output_shape).pop(concat_axis) for l in layers])
            if len(input_shapes) > 1:
                raise Exception(""concat" mode can only merge layers with matching output shapes except for the concat axis")

        self.mode = mode

After Change

        elif mode == "concat":
            input_shapes = set()
            for l in layers:
                oshape = list(l.output_shape)
                oshape.pop(concat_axis)
                oshape = tuple(oshape)
                input_shapes.add(oshape)
            if len(input_shapes) > 1:
                raise Exception(""concat" mode can only merge layers with matching output shapes except for the concat axis")

Instances