1、Tensorflow 需要为输入数据创建 Placeholders(占位符),这些数据将会在运行 Session(会话)时被 fed(喂)到 Model(模型)中
2、Tensorflow:tf.placeholder
创建占位符,例
# GRADED FUNCTION: create_placeholders def create_placeholders(n_H0, n_W0, n_C0, n_y): """ Creates the placeholders for the tensorflow session. Arguments: n_H0 -- scalar, height of an input image n_W0 -- scalar, width of an input image n_C0 -- scalar, number of channels of the input n_y -- scalar, number of classes Returns: X -- placeholder for the data input, of shape [None, n_H0, n_W0, n_C0] and dtype "float" Y -- placeholder for the input labels, of shape [None, n_y] and dtype "float" """ ### START CODE HERE ### (≈2 lines) X = tf.placeholder(tf.float32, shape = [None, n_H0, n_W0, n_C0], name = 'X') Y = tf.placeholder(tf.float32, shape = [None, n_y], name = 'Y') ### END CODE HERE ### return X, Y