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Computes the gradient for the tanh of x wrt its input.

Specifically, grad = dy * (1 - y*y), where y = tanh(x), and dy is the corresponding input gradient.

y A Tensor. Must be one of the following types: bfloat16, half, float32, float64, complex64, complex128.
dy A Tensor. Must have the same type as y.
name A name for the operation (optional).

A Tensor. Has the same type as y.