Function check_csr

implicit/utils.py:159–169

(user_items)

def check_csr(user_items):
    if not isinstance(user_items, scipy.sparse.csr_matrix):
        class_name = user_items.__class__.__name__
        start = time.time()
        user_items = user_items.tocsr()
        warnings.warn(
            f"Method expects CSR input, and was passed {class_name} instead. "
            f"Converting to CSR took {time.time() - start} seconds",
            ParameterWarning,
        )
    return user_items