Function safelog

imperative/python/test/unit/functional/test_loss.py:129–131

(x)

def _ctc_npy_single_seq(pred, label, blank):
    def safelog(x):
        eps = np.finfo(x.dtype).tiny
        return np.log(np.maximum(x, eps))

    def log_sum_exp(x, y):
        x, y = np.maximum(x, y), np.minimum(x, y)