utils/gluon/utils/mobilenetv2.py [70:78]:
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    def _sum(self, x1, x2):
        if (x1 is not None) and (x2 is not None):
            return x1 + x2
        else:
            return x1 if x2 is None else x2

    def hybrid_forward(self, F, x1, x2=None):
        x = (x1, x2)
        shortcut = x
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utils/gluon/utils/resnetv2.py [71:79]:
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    def _sum(self, x1, x2):
        if (x1 is not None) and (x2 is not None):
            return x1 + x2
        else:
            return x1 if x2 is None else x2

    def hybrid_forward(self, F, x1, x2=None):
        x = (x1, x2)
        shortcut = x
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