tf.contrib.seq2seq.safe_cumprod

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Computes cumprod of x in logspace using cumsum to avoid underflow.

tf.contrib.seq2seq.safe_cumprod(
    x, *args, **kwargs
)

The cumprod function and its gradient can result in numerical instabilities when its argument has very small and/or zero values. As long as the argument is all positive, we can instead compute the cumulative product as exp(cumsum(log(x))). This function can be called identically to tf.cumprod.