sgd_optimizer.py 文件源码

def _apply_sparse(self, cache):
    """"""

    g_t, idxs = cache['g_t'], cache['idxs']
    idxs, idxs_ = tf.unique(idxs)
    g_t_ = tf.unsorted_segment_sum(g_t, idxs_, tf.size(idxs))

    cache['g_t'] = g_t_
    cache['idxs'] = idxs
    cache['s_t'] = self.learning_rate * g_t_

    return cache