Hi List,

I have an array, x, with dimensions (K,M,M). I would like to compute a
new array, y ~ (K,M*(M+1)/2), such that

y[k] = numpy.tril(x[k]).flatten() for each k = 0,..,K-1

Is there a way to do this without looping? I was trying with
tril_indices but couldn't quite get the logic right.

Thanks,
dm
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