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重塑我用下面的重塑在我的模型:Tensorflow可变长度
data = tf.placeholder(tf.float32, shape = (BATCH_SIZE, N_CHUNK, WIN * N_SENSOR))
data_flattened = tf.reshape(data, [BATCH_SIZE*N_CHUNK, WIN*N_SENSOR])
现在我想N_CHUNK是可变的(即在尺寸NONE)。我如何实施重塑?无维必须是第一维吗?