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fufufukakaka/fast_access_sparse_matrix

Created May 19, 2019 01:05
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fast_access_sparse_matrix
def fast_access_sparse_matrix(idx, row, sparse_matrix):
# index
start, stop = sparse_matrix.indptr[idx], sparse_matrix.indptr[idx+1]
index_data = sparse_matrix.data[start:stop]
index_rows = sparse_matrix.indices[start:stop]
# row
## find row index
if row in index_rows:
row_index = np.where(index_rows==row)[0][0]
extract_elements = index_data[row_index]
else:
extract_elements = 0
return extract_elements
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