Local Minima
is_local_min(input: any[] | Mat | Tensor, dim: Number) : Mat | Tensor
param input a JS array, matrix or tensor, where you want to find the local minima locations
param dim 0 (row) or 1 (column) - the direction to traverse for finding the local minima
returns - Mat | Tensor - a matrix or tensor with 1 denoting local min value and 0 denoting not local min
Notice if dim is 1, then input must be a 2-d matrix
This function simply finds all the local minimum value locations of the input.