Unable to run tensorflow code - tensorflow

Question

Here is the piece of code I cloned off of Github and I am having a hard time getting it to work.
def lstm_doc_enc(input_cnn,
batch_size=20,
num_rnn_layers=2,
rnn_size=650,
max_doc_length=35,
dropout=0.0):
# lstm document encoder
with tf.variable_scope('LSTMenc') as scope:
def create_rnn_cell():
cell = tf.contrib.rnn.BasicLSTMCell(rnn_size, state_is_tuple=True, forget_bias=0.0, reuse=True)
if dropout > 0.0:
cell = tf.contrib.rnn.DropoutWrapper(cell, output_keep_prob=1.-dropout)
return cell
if num_rnn_layers > 1:
cell = tf.contrib.rnn.MultiRNNCell([create_rnn_cell() for _ in range(num_rnn_layers)], state_is_tuple=True)
else:
cell = create_rnn_cell()
initial_rnn_state = cell.zero_state(batch_size, dtype=tf.float32)
input_cnn = tf.reshape(input_cnn, [batch_size, max_doc_length, -1])
input_cnn2 = [tf.squeeze(x, [1]) for x in tf.split(input_cnn, max_doc_length, 1)]
outputs, final_rnn_state = tf.contrib.rnn.static_rnn(cell, input_cnn2,
initial_state=initial_rnn_state, dtype=tf.float32)
return adict(
initial_enc_state=initial_rnn_state,
final_enc_state=final_rnn_state,
enc_outputs=outputs
)
I cloned it from the repository of NeuralSum.
If I leave reuse=True while creating the BasicLSTMCell, it gives the following error
Traceback (most recent call last):
File "pretrain.py", line 358, in <module>
tf.app.run()
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/platform/app.py", line 48, in run
_sys.exit(main(_sys.argv[:1] + flags_passthrough))
File "pretrain.py", line 244, in main
train_model = build_model(word_vocab, train=True)
File "pretrain.py", line 146, in build_model
dropout=FLAGS.dropout))
File "/home/raghuram.vadapalli/styletransfer/NeuralSum/model.py", line 218, in lstm_doc_enc
initial_state=initial_rnn_state, dtype=tf.float32)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn.py", line 197, in static_rnn
(output, state) = call_cell()
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn.py", line 184, in <lambda>
call_cell = lambda: cell(input_, state)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn_cell_impl.py", line 713, in __call__
output, new_state = self._cell(inputs, state, scope)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn_cell_impl.py", line 241, in __call__
concat = _linear([inputs, h], 4 * self._num_units, True)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn_cell_impl.py", line 1044, in _linear
_WEIGHTS_VARIABLE_NAME, [total_arg_size, output_size], dtype=dtype)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/variable_scope.py", line 1049, in get_variable
use_resource=use_resource, custom_getter=custom_getter)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/variable_scope.py", line 948, in get_variable
use_resource=use_resource, custom_getter=custom_getter)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/variable_scope.py", line 356, in get_variable
validate_shape=validate_shape, use_resource=use_resource)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/variable_scope.py", line 341, in _true_getter
use_resource=use_resource)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/variable_scope.py", line 671, in _get_single_variable
"VarScope?" % name)
ValueError: Variable Model/LSTMenc/rnn/basic_lstm_cell/weights does not exist, or was not created with tf.get_variable(). Did you mean to set reuse=None in VarScope?
If I don't put reuse=True, I get this other error:
Traceback (most recent call last):
File "pretrain.py", line 358, in <module>
tf.app.run()
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/platform/app.py", line 48, in run
_sys.exit(main(_sys.argv[:1] + flags_passthrough))
File "pretrain.py", line 251, in main
valid_model = build_model(word_vocab, train=False)
File "pretrain.py", line 200, in build_model
dropout=FLAGS.dropout))
File "/home/raghuram.vadapalli/styletransfer/NeuralSum/model.py", line 218, in lstm_doc_enc
initial_state=initial_rnn_state, dtype=tf.float32)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn.py", line 197, in static_rnn
(output, state) = call_cell()
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn.py", line 184, in <lambda>
call_cell = lambda: cell(input_, state)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn_cell_impl.py", line 235, in __call__
with _checked_scope(self, scope or "basic_lstm_cell", reuse=self._reuse):
File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
return self.gen.next()
File "/usr/local/lib/python2.7/dist-packages/tensorflow/contrib/rnn/python/ops/core_rnn_cell_impl.py", line 93, in _checked_scope
"the argument reuse=True." % (scope_name, type(cell).__name__))
ValueError: Attempt to have a second RNNCell use the weights of a variable scope that already has weights: 'Model/LSTMenc/rnn/basic_lstm_cell'; and the cell was not constructed as BasicLSTMCell(..., reuse=True). To share the weights of an RNNCell, simply reuse it in your second calculation, or create a new one with the argument reuse=True.
I don't have a lot of experience with variable scopes in tensorflow. I tried to google a lot and it came of no use. I hope someone understands what is wrong here and help me.