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Question on function modify_forward

Hi, thanks for your work, I have following two questions:
(1)Can you explain the function modify_forward in count_flops.py, I cannot understand the recursive function here?
https://github.com/BayesWatch/pytorch-moonshine/blob/master/count_flops.py#L116

    def modify_forward(model):
        for child in model.children():
            if should_measure(child):
                def new_forward(m):
                    def lambda_forward(x):
                        measure_layer(m, x)
                        return m.old_forward(x)
                    return lambda_forward
                child.old_forward = child.forward
                child.forward = new_forward(child)
            else:
                modify_forward(child)

I am confused on what the purpose of the following two lines, can you explain a little bit?

child.old_forward = child.forward
child.forward = new_forward(child)

(2) why batch_norm does not contain flops?

    elif type_name in ['BatchNorm2d', 'Dropout2d', 'DropChannel', 'Dropout']:
        delta_params = get_layer_param(layer)

Thanks in advance

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