This is a pure-TF implementation of tf.math.cumulative_logsumexp; unlike
the built-in op, it supports XLA compilation. It uses a similar algorithmic
technique (parallel prefix sum) as the built-in op, so it has similar numerics
and asymptotic performace. However, this implemenentation currently has higher
overhead, so it is significantly slower on smaller inputs (n < 10000).
the Tensor to sum over.
int Tensor axis to sum over.
Python str name prefixed to Ops created by this function.
Default value: None (i.e., 'cumulative_logsumexp').