错误：
RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation: [torch.cuda.FloatTensor [100, 1]], which is output 0 of TanhBackward0, is at version 1; expected version 0 instead. Hint: enable anomaly detection to find the operation that failed to compute its gradient, with torch.autograd.set_detect_anomaly(True).
场景：在训练pytorch网络的时候的报错。
解决方法：
mu *= 2
改为：
mu = mu * 2
Original: https://www.cnblogs.com/Twobox/p/16736031.html
Author: Wei_Xiong
Title: 记一次BUG，RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation
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