crossval_300.py 文件源码

def __init__(self, n_labeled, n_unlabeled, n_classes):
        self._t_uu = t_uu = tf.placeholder(tf.float32, shape=[n_unlabeled, n_unlabeled])
        self._t_ul = t_ul = tf.placeholder(tf.float32, shape=[n_unlabeled, n_labeled])
        self._y_l = y_l = tf.placeholder(tf.float32, shape=[n_labeled, n_classes])

        tuu = tf.sigmoid(t_uu)
        tul = tf.sigmoid(t_ul)

        # column normalization
        tuu_col_norms = tf.norm(tuu, ord=1, axis=0)
        tul_col_norms = tf.norm(tul, ord=1, axis=0)
        tuu /= tuu_col_norms
        tul /= tul_col_norms

        # row normalization
        tuu_row_norms = tf.norm(tuu, ord=1, axis=1)
        tul_row_norms = tf.norm(tul, ord=1, axis=1)
        tuu /= tf.reshape(tuu_row_norms, [n_unlabeled, 1])
        tul /= tf.reshape(tul_row_norms, [n_unlabeled, 1])

        I = tf.eye(n_unlabeled, dtype=tf.float32)
        inv = tf.matrix_solve_ls((I - tuu), I, l2_regularizer=0.01)

        y_u = tf.matmul(tf.matmul(inv, tul), y_l)

        y = tf.concat([y_u, y_l], 0)
        self._y = y = tf.clip_by_value(y, 1e-15, float("inf"))