# Buggy code
def _decay_weights_op(self, var):
    if not self._decay_var_list or var.ref() in self._decay_var_list:
        return var.assign_sub(
            self._get_hyper("weight_decay", var.dtype) * var, self._use_locking
        )
    return tf.no_op()


# Traceback (tensorflow.python.framework.errors_impl.InvalidArgumentError)
Traceback (most recent call last):
File "tmp2.py", line 42, in <module>
model.fit(x_train, y_train, epochs=40, validation_split=0.1)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/keras/engine/training.py", line 728, in fit
use_multiprocessing=use_multiprocessing)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/keras/engine/training_v2.py", line 324, in fit
total_epochs=epochs)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/keras/engine/training_v2.py", line 123, in run_one_epoch
batch_outs = execution_function(iterator)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/keras/engine/training_v2_utils.py", line 86, in execution_function
distributed_function(input_fn))
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/eager/def_function.py", line 457, in __call__
result = self._call(*args, **kwds)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/eager/def_function.py", line 520, in _call
return self._stateless_fn(*args, **kwds)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/eager/function.py", line 1823, in __call__
return graph_function._filtered_call(args, kwargs)  # pylint: disable=protected-access
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/eager/function.py", line 1141, in _filtered_call
self.captured_inputs)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/eager/function.py", line 1224, in _call_flat
ctx, args, cancellation_manager=cancellation_manager)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/eager/function.py", line 511, in call
ctx=ctx)
File "/home/yetao/.local/lib/python3.5/site-packages/tensorflow_core/python/eager/execute.py", line 67, in quick_execute
six.raise_from(core._status_to_exception(e.code, message), None)
File "<string>", line 2, in raise_from
tensorflow.python.framework.errors_impl.InvalidArgumentError: Cannot assign a device for operation sequential/conv2d/Conv2D/ReadVariableOp: Could not satisfy explicit device specification '/job:localhost/replica:0/task:0/device:GPU:0' because no supported kernel for GPU devices is available.
Colocation Debug Info:
Colocation group had the following types and supported devices:
Root Member(assigned_device_name_index_=2 requested_device_name_='/job:localhost/replica:0/task:0/device:GPU:0' assigned_device_name_='/job:localhost/replica:0/task:0/device:GPU:0' resource_device_name_='/job:localhost/replica:0/task:0/device:GPU:0' supported_device_types_=[CPU] possible_devices_=[]
RealDiv: GPU CPU XLA_CPU XLA_GPU
LogicalAnd: GPU CPU XLA_CPU XLA_GPU
_Arg: GPU CPU XLA_CPU XLA_GPU
ReadVariableOp: GPU CPU XLA_CPU XLA_GPU
Greater: GPU CPU XLA_CPU XLA_GPU
Sub: GPU CPU XLA_CPU XLA_GPU
Const: GPU CPU XLA_CPU XLA_GPU
Pack: GPU CPU XLA_CPU XLA_GPU
LessEqual: GPU CPU XLA_CPU XLA_GPU
Identity: GPU CPU XLA_CPU XLA_GPU
Cast: GPU CPU XLA_CPU XLA_GPU
Sum: GPU CPU XLA_CPU XLA_GPU
ResourceApplyAdam: GPU CPU XLA_CPU XLA_GPU
Mul: GPU CPU XLA_CPU XLA_GPU
Sqrt: GPU CPU XLA_CPU XLA_GPU
AssignSubVariableOp: GPU CPU XLA_CPU XLA_GPU
AddV2: GPU CPU XLA_CPU XLA_GPU
Pow: GPU CPU XLA_CPU XLA_GPU

Colocation members, user-requested devices, and framework assigned devices, if any:
sequential_conv2d_conv2d_readvariableop_resource (_Arg)  framework assigned device=/job:localhost/replica:0/task:0/device:GPU:0
adamw_adamw_update_resourceapplyadam_m (_Arg)  framework assigned device=/job:localhost/replica:0/task:0/device:GPU:0
adamw_adamw_update_resourceapplyadam_v (_Arg)  framework assigned device=/job:localhost/replica:0/task:0/device:GPU:0
sequential/conv2d/Conv2D/ReadVariableOp (ReadVariableOp) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Read/ReadVariableOp (ReadVariableOp) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/Const (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/Const_1 (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/Const_2 (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/Const_3 (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/Const_4 (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/LessEqual (LessEqual) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/Greater (Greater) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/Greater_1 (Greater) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/LessEqual_1 (LessEqual) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/and (LogicalAnd) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/preds_c (Pack) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/Cast (Cast) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/Const (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/num_true_conds (Sum) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/n_true_conds (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/LessEqual (LessEqual) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/Assert/Const (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/Assert/AssertGuard/Identity (Identity) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/PiecewiseConstant/case/cond/Identity (Identity) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/mul/x (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/mul (Mul) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/mul_1/ReadVariableOp (ReadVariableOp) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/mul_1 (Mul) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/AssignSubVariableOp (AssignSubVariableOp) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Identity_1 (Identity) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/add/y (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/add (AddV2) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Cast (Cast) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Identity_2 (Identity) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Identity_3 (Identity) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Pow (Pow) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Pow_1 (Pow) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/sub/x (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/sub (Sub) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Sqrt (Sqrt) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/sub_1/x (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/sub_1 (Sub) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/truediv (RealDiv) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/mul_2 (Mul) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/Const (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/sub_2/x (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/sub_2 (Sub) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/sub_3/x (Const) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/sub_3 (Sub) /job:localhost/replica:0/task:0/device:GPU:0
AdamW/AdamW/update/ResourceApplyAdam (ResourceApplyAdam) /job:localhost/replica:0/task:0/device:GPU:0

Op: ReadVariableOp
Node attrs: dtype=DT_FLOAT
Registered kernels:
device='XLA_CPU_JIT'; dtype in [DT_FLOAT, DT_DOUBLE, DT_INT32, DT_UINT8, DT_INT8, ..., DT_BFLOAT16, DT_COMPLEX128, DT_HALF, DT_UINT32, DT_UINT64]
device='XLA_GPU_JIT'; dtype in [DT_FLOAT, DT_DOUBLE, DT_INT32, DT_UINT8, DT_INT8, ..., DT_BFLOAT16, DT_COMPLEX128, DT_HALF, DT_UINT32, DT_UINT64]
device='GPU'
device='CPU'
device='XLA_CPU'
device='XLA_GPU'

[[{{node sequential/conv2d/Conv2D/ReadVariableOp}}]] [Op:__inference_distributed_function_2137]

# Fixed code
def _decay_weights_op(self, var):
    if not self._decay_var_list or var.ref() in self._decay_var_list:
        return var.assign_sub(self._decayed_wd(var.dtype) * var, self._use_locking)
    return tf.no_op()