GPU error & other things

[cymqqqq]

Hi.I got a problem here: When I run train.py,error exists: Traceback (most recent call last): File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py", line 1356, in _do_call return fn(*args) File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py", line 1339, in _run_fn self._extend_graph() File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py", line 1374, in _extend_graph tf_session.ExtendSession(self._session) tensorflow.python.framework.errors_impl.InvalidArgumentError: Cannot assign a device for operation model_1/ones: {{node model_1/ones}}was explicitly assigned to /device:GPU:0 but available devices are [ /job:localhost/replica:0/task:0/device:CPU:0, /job:localhost/replica:0/task:0/device:XLA_CPU:0, /job:localhost/replica:0/task:0/device:XLA_GPU:0, /job:localhost/replica:0/task:0/device:XLA_GPU:1, /job:localhost/replica:0/task:0/device:XLA_GPU:2, /job:localhost/replica:0/task:0/device:XLA_GPU:3 ]. Make sure the device specification refers to a valid device. [[model_1/ones]]

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "train.py", line 203, in sess.run(initializer) File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py", line 950, in run run_metadata_ptr) File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py", line 1173, in _run feed_dict_tensor, options, run_metadata) File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py", line 1350, in _do_run run_metadata) File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py", line 1370, in _do_call raise type(e)(node_def, op, message) tensorflow.python.framework.errors_impl.InvalidArgumentError: Cannot assign a device for operation model_1/ones: node model_1/ones (defined at /home/CYM/pixel-cnn/pixel_cnn_pp/model.py:36) was explicitly assigned to /device:GPU:0 but available devices are [ /job:localhost/replica:0/task:0/device:CPU:0, /job:localhost/replica:0/task:0/device:XLA_CPU:0, /job:localhost/replica:0/task:0/device:XLA_GPU:0, /job:localhost/replica:0/task:0/device:XLA_GPU:1, /job:localhost/replica:0/task:0/device:XLA_GPU:2, /job:localhost/replica:0/task:0/device:XLA_GPU:3 ]. Make sure the device specification refers to a valid device. [[model_1/ones]] should I reinstall the tensorflow-gpu? I don't know why. and another problem in train.py ,line 172: x = np.cast[np.float32]((x - 127.5) / 127.5) # input to pixelCNN is scaled from uint8 [0,255] to float in range [-1,1] you say "input to pixelCNN is scaled from uint8 [0,255] to float in range [-1,1]" why do this operation? can you explain thx!