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# scipy.sparse.lil_matrix.count_nonzero

`lil_matrix.``count_nonzero`()

  Number of non-zero entries, equivalent to

  np.count_nonzero(a.toarray())

  Unlike getnnz() and the nnz property, which return the number of stored entries (the length of the data attribute), this method counts the actual number of non-zero entries in data.