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running product $\prod +$

Computes the running product of the input tensor along a given axis. For example, take this rank 2 tensor:


\begin{displaymath} \left( \begin{array}{cccc} 1& 2& 3& 4 \\ 5& 4& 3& 2 \\ 8& 7& 6& 5 \end{array} \right) \end{displaymath}

The running product of this tensor, along the horizontal dimension, is:


\begin{displaymath} \left( \begin{array}{cccc} 1& 2& 6& 24\\ 5& 20& 60& 120\\ 8& 56& 336& 1680 \end{array} \right) \end{displaymath}