[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-10-31 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r229943760
 
 

 ##
 File path: example/rnn-backends/word_lm/model.py
 ##
 @@ -0,0 +1,152 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""
+Module: model
+
+Description: This file creates the computation graph for training purposes.
+"""
+
+import mxnet as mx
+
+
+def rnn(bptt, vocab_size, num_embed, nhid,
+num_layers, dropout, batch_size, tied, backend):
+"""
+Creates the computation graph for training.
+"""
+# 
==
+# Encoder
+# 
==
+
+data = mx.sym.Variable('data')
+weight = mx.sym.Variable("encoder_weight", init=mx.init.Uniform(0.1))
+embed = mx.sym.Embedding(data=data, weight=weight, input_dim=vocab_size,
+ output_dim=num_embed, name='embed')
+
+outputs = mx.sym.Dropout(embed, p=dropout)
+
+# 
==
+# RNN
+# 
==
+
+# stacked rnn layers
+
+# Given below is the original source code, which we do argue makes bad use 
of CuDNN-RNN
+# as there is no need to slice each layer apart, please refer to the open 
issue on github @
+# https://github.com/apache/incubator-mxnet/issues/10304
+# The throughput measurements reported by MXNet speedometer showed that
+# there is around 10~20% increase in throughput after all the layers have 
been fused.
+# The implementation also messed up with the order of cell and hidden 
state,
+# because according to the state order specified in rnn_cell.py (+L682),
+# cell state should appear AFTER hidden state in FusedRNNCell. However, 
this has zero effect
+# on the final training results because they are both zero-initialized.
+
+states = []
+state_names = []
+
+# for i in range(num_layers):
+# prefix = 'lstm_l%d_' % i
 
 Review comment:
   Previously when working on benchmarking, I noticed that there are 
inefficiencies in the original implementation of the word-level language 
modeling benchmark (as was discussed here: 
https://github.com/apache/incubator-mxnet/issues/10304#issuecomment-377031511). 
I therefore came up with my own implementation that achieves the same 
validation score on the same dataset. The commented code-block is used to show 
**how the original implementation and my implementation do the same thing 
algorithmically**.


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[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-10-31 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r229943448
 
 

 ##
 File path: example/rnn-backends/word_lm/model.py
 ##
 @@ -0,0 +1,152 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""
+Module: model
+
+Description: This file creates the computation graph for training purposes.
+"""
+
+import mxnet as mx
+
+
+def rnn(bptt, vocab_size, num_embed, nhid,
+num_layers, dropout, batch_size, tied, backend):
+"""
+Creates the computation graph for training.
+"""
+# 
==
+# Encoder
+# 
==
+
+data = mx.sym.Variable('data')
+weight = mx.sym.Variable("encoder_weight", init=mx.init.Uniform(0.1))
+embed = mx.sym.Embedding(data=data, weight=weight, input_dim=vocab_size,
+ output_dim=num_embed, name='embed')
+
+outputs = mx.sym.Dropout(embed, p=dropout)
+
+# 
==
+# RNN
+# 
==
+
+# stacked rnn layers
+
+# Given below is the original source code, which we do argue makes bad use 
of CuDNN-RNN
+# as there is no need to slice each layer apart, please refer to the open 
issue on github @
+# https://github.com/apache/incubator-mxnet/issues/10304
+# The throughput measurements reported by MXNet speedometer showed that
+# there is around 10~20% increase in throughput after all the layers have 
been fused.
+# The implementation also messed up with the order of cell and hidden 
state,
+# because according to the state order specified in rnn_cell.py (+L682),
+# cell state should appear AFTER hidden state in FusedRNNCell. However, 
this has zero effect
+# on the final training results because they are both zero-initialized.
+
+states = []
+state_names = []
+
+# for i in range(num_layers):
+# prefix = 'lstm_l%d_' % i
 
 Review comment:
   @Roshrini I am terribly sorry for the late response. I do not this it is 
appropriate for me to remove this part of the comments because they are used to 
show the discrepencies between the original word-level language modeling 
benchmark and the benchmark that I am using (i.e. it is deliberately left there 
for **comparison** purpose). 


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[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-10-31 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r229943448
 
 

 ##
 File path: example/rnn-backends/word_lm/model.py
 ##
 @@ -0,0 +1,152 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""
+Module: model
+
+Description: This file creates the computation graph for training purposes.
+"""
+
+import mxnet as mx
+
+
+def rnn(bptt, vocab_size, num_embed, nhid,
+num_layers, dropout, batch_size, tied, backend):
+"""
+Creates the computation graph for training.
+"""
+# 
==
+# Encoder
+# 
==
+
+data = mx.sym.Variable('data')
+weight = mx.sym.Variable("encoder_weight", init=mx.init.Uniform(0.1))
+embed = mx.sym.Embedding(data=data, weight=weight, input_dim=vocab_size,
+ output_dim=num_embed, name='embed')
+
+outputs = mx.sym.Dropout(embed, p=dropout)
+
+# 
==
+# RNN
+# 
==
+
+# stacked rnn layers
+
+# Given below is the original source code, which we do argue makes bad use 
of CuDNN-RNN
+# as there is no need to slice each layer apart, please refer to the open 
issue on github @
+# https://github.com/apache/incubator-mxnet/issues/10304
+# The throughput measurements reported by MXNet speedometer showed that
+# there is around 10~20% increase in throughput after all the layers have 
been fused.
+# The implementation also messed up with the order of cell and hidden 
state,
+# because according to the state order specified in rnn_cell.py (+L682),
+# cell state should appear AFTER hidden state in FusedRNNCell. However, 
this has zero effect
+# on the final training results because they are both zero-initialized.
+
+states = []
+state_names = []
+
+# for i in range(num_layers):
+# prefix = 'lstm_l%d_' % i
 
 Review comment:
   @Roshrini I am terribly sorry for the late response. I do not this it is 
appropriate for me to remove this part of the comments because they are used to 
show the discrepencies between the original word language-modeling benchmark 
and the benchmark that I am using (i.e. it is deliberately left there for 
**comparison** purpose). 


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[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-10-11 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r224534555
 
 

 ##
 File path: src/operator/contrib/cu_open_lstm_rnn-inl.cuh
 ##
 @@ -0,0 +1,907 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*!
+ * Copyright (c) 2018 by Contributors
+ * \file open_lstm_rnn-inl.cuh
+ * \brief LSTM RNN Open-Source CUDA Implementation
+ * \author Bojian (Jack) Zheng, Gennady Pekhimenko, Jeremy Appleyard
+ */
+#ifndef MXNET_OPERATOR_CONTRIB_CU_OPEN_LSTM_RNN_INL_CUH_
 
 Review comment:
   @apeforest The reason why I start this file with `cu` is because `cu` is 
considered as the abbreviation for **CUDA** implementation (e.g., cuDNN, 
cuBLAS, cuSparse). 


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[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-10-10 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r224286378
 
 

 ##
 File path: src/operator/contrib/cu_open_lstm_rnn-inl.cuh
 ##
 @@ -0,0 +1,1125 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*!
+ * Copyright (c) 2018 by Contributors
+ * \file open_lstm_rnn-inl.cuh
+ * \brief LSTM RNN Open-Source CUDA Implementation
+ * \author Bojian (Jack) Zheng, Gennady Pekhimenko, Jeremy Appleyard
+ */
+#ifndef MXNET_OPERATOR_CONTRIB_CU_OPEN_LSTM_RNN_INL_CUH_
+#define MXNET_OPERATOR_CONTRIB_CU_OPEN_LSTM_RNN_INL_CUH_
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include "./open_lstm_rnn-inl.h"
+#include "./open_lstm_rnn_include/dropout.cuh"
+#include "./open_lstm_rnn_include/lstm_cell.cuh"
+#include "./open_lstm_rnn_include/cublas_matmul.h"
+#include "./open_lstm_rnn_include/cublas_transpose.h"
+
+#define RE_CAST(ptr) reinterpret_cast < float * > (ptr)
+
+namespace mxnet {
+namespace op {
+
+class CUOpenLSTMRNNOp : public Operator {
+ public:
+  explicit CUOpenLSTMRNNOp(OpenLSTMRNNParam param) {
+this->param_ = param; initialized_ = false;
+  }
+
+  ~CUOpenLSTMRNNOp() {
+//=
+// Free the allocated workspace memory.
+//=
+Storage::Get()->Free(m_data_T_major);
+Storage::Get()->Free(m_data_T_major_grad);
+Storage::Get()->Free(m_cell);
+Storage::Get()->Free(m_hidden);
+Storage::Get()->Free(m_i2h_workspace);
+Storage::Get()->Free(m_h2h_workspace);
+Storage::Get()->Free(m_i2h_grad_workspace);
+Storage::Get()->Free(m_h2h_grad_workspace);
+Storage::Get()->Free(m_linear_gates);
+//=
+// Destroy the cuBLAS handle.
+//=
+CUBLAS_CALL(cublasDestroy(m_cublas_handle));
+//=
+// Free the workers (cudaStream and cudaEvent).
+//=
+for (unsigned layer_idx = 0; layer_idx < param_.num_layers; ++layer_idx) {
+  CUDA_CALL(cudaStreamDestroy(m_stream_i2h[layer_idx]));
+  m_stream_i2h[layer_idx] = NULL;
+  CUDA_CALL(cudaStreamDestroy(m_stream_h2h[layer_idx]));
+  m_stream_h2h[layer_idx] = NULL;
+}
+delete [] m_stream_i2h; m_stream_i2h = NULL;
+delete [] m_stream_h2h; m_stream_h2h = NULL;
+for (unsigned layer_idx = 0; layer_idx < param_.num_layers; ++layer_idx) {
+  for (unsigned seq_idx = 0; seq_idx < param_.seq_len; ++seq_idx) {
+CUDA_CALL(cudaEventDestroy(m_event_i2h[layer_idx][seq_idx]));
+m_event_i2h[layer_idx][seq_idx] = NULL;
+CUDA_CALL(cudaEventDestroy(m_event_h2h[layer_idx][seq_idx]));
+m_event_h2h[layer_idx][seq_idx] = NULL;
+  }
+  delete [] m_event_i2h[layer_idx]; m_event_i2h[layer_idx] = NULL;
+  delete [] m_event_h2h[layer_idx]; m_event_h2h[layer_idx] = NULL;
+}
+delete [] m_event_i2h; m_event_i2h = NULL;
+delete [] m_event_h2h; m_event_h2h = NULL;
+//=
+// Destroy the cuRAND handle and associated workspace.
+//=
+if (param_.i_dp_prob != 0 && param_.num_layers > 1) {
+  CURAND_CALL(curandDestroyGenerator(m_rng));
+  Storage::Get()->Free(m_i_dp_uniform_rv);
+  Storage::Get()->Free(m_i_dp_workspace);
+}
+  }
+
+  virtual void Forward(const OpContext ,
+   const std::vector _data,
+   const std::vector ,
+   const std::vector _data,
+   const std::vector _args) {
+using namespace mshadow;
+
+//=
+// IO Data
+

[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-10-10 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r224284934
 
 

 ##
 File path: src/operator/contrib/open_lstm_rnn.cc
 ##
 @@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*!
+ * Copyright (c) 2018 by Contributors
+ * \file open_lstm_rnn.cc
+ * \brief LSTM RNN Open-Source CUDA Implementation
+ * \author Bojian (Jack) Zheng, Gennady Pekhimenko
+ */
+#include "./open_lstm_rnn-inl.h"
+
+namespace mxnet {
+namespace op {
+
+template <>
+Operator *CreateOp(OpenLSTMRNNParam param, int dtype) {
+  LOG(FATAL) << "OpenLSTMRNN is only available for gpu at the moment.";
+
+  Operator * op = nullptr;
+
+  MSHADOW_REAL_TYPE_SWITCH(dtype, DType,
 
 Review comment:
   @apeforest This was written analogously with the [`cuDNN` implementation of 
LSTM 
RNN](https://github.com/apache/incubator-mxnet/blob/v0.12.0/src/operator/rnn.cc).


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[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-10-10 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r224284934
 
 

 ##
 File path: src/operator/contrib/open_lstm_rnn.cc
 ##
 @@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*!
+ * Copyright (c) 2018 by Contributors
+ * \file open_lstm_rnn.cc
+ * \brief LSTM RNN Open-Source CUDA Implementation
+ * \author Bojian (Jack) Zheng, Gennady Pekhimenko
+ */
+#include "./open_lstm_rnn-inl.h"
+
+namespace mxnet {
+namespace op {
+
+template <>
+Operator *CreateOp(OpenLSTMRNNParam param, int dtype) {
+  LOG(FATAL) << "OpenLSTMRNN is only available for gpu at the moment.";
+
+  Operator * op = nullptr;
+
+  MSHADOW_REAL_TYPE_SWITCH(dtype, DType,
 
 Review comment:
   @apeforest This was written analogously with the [`cuDNN` implementation of 
LSTM 
RNN](https://github.com/apache/incubator-mxnet/blob/v0.12.0/src/operator/rnn.cc).


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[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-10-10 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r224284822
 
 

 ##
 File path: src/operator/contrib/open_lstm_rnn.cc
 ##
 @@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*!
+ * Copyright (c) 2018 by Contributors
+ * \file open_lstm_rnn.cc
+ * \brief LSTM RNN Open-Source CUDA Implementation
+ * \author Bojian (Jack) Zheng, Gennady Pekhimenko
+ */
+#include "./open_lstm_rnn-inl.h"
+
+namespace mxnet {
+namespace op {
+
+template <>
+Operator *CreateOp(OpenLSTMRNNParam param, int dtype) {
+  LOG(FATAL) << "OpenLSTMRNN is only available for gpu at the moment.";
+
+  Operator * op = nullptr;
+
+  MSHADOW_REAL_TYPE_SWITCH(dtype, DType,
 
 Review comment:
   @apeforest This was written analogously with the [`cuDNN` implementation of 
LSTM 
RNN](https://github.com/apache/incubator-mxnet/blob/v0.12.0/src/operator/rnn.cc).


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[GitHub] ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.

2018-06-28 Thread GitBox
ArmageddonKnight commented on a change in pull request #11364: [MXNET-490] 
Added OpenLSTMRNN together with benchmarks and Tensorboard callback routines.
URL: https://github.com/apache/incubator-mxnet/pull/11364#discussion_r199024323
 
 

 ##
 File path: example/rnn-backends/bucketing/dataset/download_ptb.sh
 ##
 @@ -0,0 +1,27 @@
+#!/bin/sh
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# This file downloads the PTB dataset.
+
+mkdir -p $(cd $(dirname $0) && pwd)/ptb
+
+cd $(cd $(dirname $0) && pwd)/ptb && \
 
 Review comment:
   Thank you for your comments. I have made changes accordingly.


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