Traceback (most recent call last):
  File "keras_cnn_vgg16_mnnist.py", line 102, in <module>
    fws()
  File "keras_cnn_vgg16_mnnist.py", line 96, in fws
    validation_data=(x_test[:10], y_test[:10]))
  File "/usr/local/lib/python2.7/dist-packages/keras/engine/training.py", line 1501, in fit
    initial_epoch=initial_epoch)
  File "/usr/local/lib/python2.7/dist-packages/keras/engine/training.py", line 1155, in _fit_loop
    outs = f(ins_batch)
  File "/usr/local/lib/python2.7/dist-packages/keras/backend/tensorflow_backend.py", line 2231, in __call__
    feed_dict=feed_dict)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.py", line 778, in run
    run_metadata_ptr)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.py", line 982, in _run
    feed_dict_string, options, run_metadata)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.py", line 1032, in _do_run
    target_list, options, run_metadata)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.py", line 1052, in _do_call
    raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Matrix size-incompatible: In[0]: [128,512], In[1]: [25088,4096]
     [[Node: vgg16/fc1/MatMul = MatMul[T=DT_FLOAT, transpose_a=false, transpose_b=false, _device="/job:localhost/replica:0/task:0/cpu:0"](vgg16/flatten/Reshape, fc1/kernel/read)]]

Caused by op u'vgg16/fc1/MatMul', defined at:
  File "keras_cnn_vgg16_mnnist.py", line 102, in <module>
    fws()
  File "keras_cnn_vgg16_mnnist.py", line 79, in fws
    model_output = model(input)
  File "/usr/local/lib/python2.7/dist-packages/keras/engine/topology.py", line 585, in __call__
    output = self.call(inputs, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/keras/engine/topology.py", line 2027, in call
    output_tensors, _, _ = self.run_internal_graph(inputs, masks)
  File "/usr/local/lib/python2.7/dist-packages/keras/engine/topology.py", line 2178, in run_internal_graph
    output_tensors = _to_list(layer.call(computed_tensor, **kwargs))
  File "/usr/local/lib/python2.7/dist-packages/keras/layers/core.py", line 840, in call
    output = K.dot(inputs, self.kernel)
  File "/usr/local/lib/python2.7/dist-packages/keras/backend/tensorflow_backend.py", line 936, in dot
    out = tf.matmul(x, y)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/math_ops.py", line 1801, in matmul
    a, b, transpose_a=transpose_a, transpose_b=transpose_b, name=name)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/gen_math_ops.py", line 1263, in _mat_mul
    transpose_b=transpose_b, name=name)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/op_def_library.py", line 768, in apply_op
    op_def=op_def)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/ops.py", line 2336, in create_op
    original_op=self._default_original_op, op_def=op_def)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/ops.py", line 1228, in __init__
    self._traceback = _extract_stack()

InvalidArgumentError (see above for traceback): Matrix size-incompatible: In[0]: [128,512], In[1]: [25088,4096]
     [[Node: vgg16/fc1/MatMul = MatMul[T=DT_FLOAT, transpose_a=false, transpose_b=false, _device="/job:localhost/replica:0/task:0/cpu:0"](vgg16/flatten/Reshape, fc1/kernel/read)]]