title: [_Derived_]RecvAsync is cancelled
body: <p>I already have this error, I have already made several changes, epochs = 100, 50, I have already changed batch_size, I have changed the TensorFlow version. But I still haven't been able to solve this problem.
  I'm using google colab.</p>
  <p>Can anybody help me?</p>
  <pre><code>model1 = Sequential()
  model1.add(LSTM(units = 15, return_sequences = True, input_shape=(2167290, 15)))
  model1.add(Dropout(0.3))
  
  model1.add(LSTM(units = 150, return_sequences = True))
  model1.add(Dropout(0.3))
  
  model1.add(LSTM(units = 100, return_sequences = True))
  model1.add(Dropout(0.3))
  
  model1.add(LSTM(units = 50, return_sequences = True))
  model1.add(Dropout(0.3))
  
  # Camada Final
  model1.add(Dense(1, activation='sigmoid'))
  
  # Compile model
  model1.compile(optimizer = 'Adam', loss = 'mean_squared_error',
                    metrics=['accuracy', 'AUC', 'Recall', 'Precision'])
  # Fit the model
  model1.fit(x_train,y_train, epochs=20, batch_size=32, validation_data=(x_test, y_test))
  </code></pre>
  <p>It is generating this error.</p>
  <pre><code>Epoch 1/20
  ---------------------------------------------------------------------------
  CancelledError                            Traceback (most recent call last)
  &lt;ipython-input-17-c4f437a21b09&gt; in &lt;module&gt;()
       19                   metrics=['accuracy', 'AUC', 'Recall', 'Precision'])
       20 # Fit the model
  ---&gt; 21 model1.fit(x_train,y_train, epochs=20, batch_size=32, validation_data=(x_test, y_test))
  
  8 frames
  /usr/local/lib/python3.6/dist-packages/tensorflow/python/eager/execute.py in quick_execute(op_name, num_outputs, inputs, attrs, ctx, name)
       58     ctx.ensure_initialized()
       59     tensors = pywrap_tfe.TFE_Py_Execute(ctx._handle, device_name, op_name,
  ---&gt; 60                                         inputs, attrs, num_outputs)
       61   except core._NotOkStatusException as e:
       62     if name is not None:
  
  CancelledError:  [_Derived_]RecvAsync is cancelled.
       [[{{node ConstantFolding/assert_greater_equal_2/Assert/AssertGuard/switch_pred/_58_const_false/_113}}]] [Op:__inference_train_function_11454]
  
  Function call stack:
  train_function
  </code></pre>