Suspect not very fit with GPU, use CPU only with tf.config.set_visible_devices([], 'GPU') or with tf.device('/cpu:0'): solve the problem. It can prosess as expect.

I tried the official version tensorflow of official website, it works as expected. conda install tensorflow Because the official version only support CPU, I suspect is the GPU problem of tensorflow-macos. Tried only use CPU on tensorflow-macos with with tf.device('/cpu:0'): It also work as expected. Suspect the bug of the GPU on tensorflow-macos cause it can't prosses RNN-like model.