Errors happens when python chunks have Non-ASCII characters in Rmd

num_epochs, lr = 5, 0.1

# 本函数已保存在d2lzh包中方便以后使用
def train_ch3(net, train_iter, test_iter, loss, num_epochs, batch_size,
              params=None, lr=None, trainer=None):
    for epoch in range(num_epochs):
        train_l_sum, train_acc_sum, n = 0.0, 0.0, 0
        for X, y in train_iter:
            with autograd.record():
                y_hat = net(X)
                l = loss(y_hat, y).sum()
            if trainer is None:
                d2l.sgd(params, lr, batch_size)
                trainer.step(batch_size)  # “softmax回归的简洁实现”一节将用到
            y = y.astype('float32')
            train_l_sum += l.asscalar()
            train_acc_sum += (y_hat.argmax(axis=1) == y).sum().asscalar()
            n += y.size
        test_acc = evaluate_accuracy(test_iter, net)
        print('epoch %d, loss %.4f, train acc %.3f, test acc %.3f'
              % (epoch + 1, train_l_sum / n, train_acc_sum / n, test_acc))

train_ch3(net, train_iter, test_iter, cross_entropy, num_epochs, batch_size,
          [W, b], lr)

The chunk above is a defined function written in Python. And there are two comments in Chinese, # 本函数已保存在d2lzh包中方便以后使用 and # “softmax回归的简洁实现”一节将用到.

When I run it, I get this error.

Warning in strsplit(code, "\n", fixed = TRUE) :
  input string 1 is invalid UTF-8

  NameError: name 'NA' is not defined

Detailed traceback: 
  File "<string>", line 1, in <module>

But when I remove the Chinese chrs, it works.

How to fix this encoding problem?

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