dot_inplace_left¶

menpo.math.
dot_inplace_left
(a, b, block_size=1000)[source]¶ Inplace dot product for memory efficiency. It computes
a * b = c
, wherea
will be replaced inplace withc
. Parameters
a (
(n_big, k)
ndarray) – First array to dot  assumed to be large. Will be damaged by this function call as it is used to store the output inplace.b (
(k, n_small)
ndarray,n_small <= k
) – The second array to dot  assumed to be small.n_small
must be smaller thank
so the result can be stored within the memory space ofa
.block_size (int, optional) – The size of the block of
a
that will be dotted againstb
in each iteration. larger block sizes increase the time performance of the dot product at the cost of a higher memory overhead for the operation.
 Returns
c (
(n_big, n_small)
ndarray) – The output of the operation. Exactly the same as a memory view ontoa
(a[:, :n_small]
) asa
is modified inplace to store the result.