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Add README.md for the cnn ms example
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<!-- | ||
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. | ||
--> | ||
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# Image Classification using Convolutional Neural Networks | ||
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Examples inside this folder show how to train CNN models using | ||
SINGA for image classification. | ||
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* `data` includes the scripts for preprocessing image datasets. | ||
Currently, MNIST, CIFAR10 and CIFAR100 are included. | ||
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* `model` includes the CNN model construction codes by creating | ||
a subclass of `Module` to wrap the neural network operations | ||
of each model. Then computational graph is enabled to optimized | ||
the memory and efficiency. | ||
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* `autograd` includes the codes to train CNN models by calling the | ||
[neural network operations](../../python/singa/autograd.py) imperatively. | ||
The computational graph is not created. | ||
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* `train_cnn.py` is the training script, which controls the training flow by | ||
doing BackPropagation and SGD update. | ||
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* `train_multiprocess.py` is the script for distributed training on a single | ||
node with multiple GPUs; it uses Python's multiprocessing module and NCCL. | ||
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* `train_mpi.py` is the script for distributed training (among multiple nodes) | ||
using MPI and NCCL for communication. | ||
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* `benchmark.py` tests the training throughput using `ResNet50` as the workload. |