Deep Learning from scratch-Chapter 4 tips on deep learning theory and implementation learned in Python

https://github.com/oreilly-japan/deep-learning-from-scratch/blob/master/ch04/two_layer_net.py

loss_W = lambda W: self.loss(x, t)

grads = {}
numerical_gradient(loss_W, self.params['W1'])

However, it seems that the second argument of numerical_gradient is passed by reference.

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