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PyTorch ResNet50 training

Description

This document has instructions for running ResNet50 training using Intel-optimized PyTorch.

Dataset

The ImageNet validation dataset is used when testing accuracy. The inference scripts use synthetic data, so no dataset is needed.

Download and extract the ImageNet2012 dataset from http://www.image-net.org/, then move validation images to labeled subfolders, using the valprep.sh shell script

The accuracy script looks for a folder named val, so after running the data prep script, your folder structure should look something like this:

imagenet
└── val
    ├── ILSVRC2012_img_val.tar
    ├── n01440764
    │   ├── ILSVRC2012_val_00000293.JPEG
    │   ├── ILSVRC2012_val_00002138.JPEG
    │   ├── ILSVRC2012_val_00003014.JPEG
    │   ├── ILSVRC2012_val_00006697.JPEG
    │   └── ...
    └── ...

The folder that contains the val directory should be set as the DATASET_DIR when running accuracy (for example: export DATASET_DIR=/home/<user>/imagenet).

Quick Start Scripts

Script name Description
training.sh Trains using one node for one epoch for the specified precision (fp32, avx-fp32, bf16, bf32 or fp16).
training_dist.sh Distributed trains using one node for one epoch for the specified precision (fp32, avx-fp32, bf16, bf32 or fp16).
training_single_socket.sh Trains on a single socket for one epoch for the specified precision (fp32, avx-fp32, bf16, bf32 or fp16).

Note: The avx-int8 and avx-fp32 precisions run the same scripts as int8 and fp32, except that the DNNL_MAX_CPU_ISA environment variable is unset. The environment variable is otherwise set to DNNL_MAX_CPU_ISA=AVX512_CORE_AMX.

  • Set ENV to use AMX: 
    export DNNL_MAX_CPU_ISA=AVX512_CORE_AMX

Bare Metal

General setup

Follow link to install Miniconda and build Pytorch, IPEX, TorchVison, Torch-CCL and Tcmalloc.

  • Install dependencies
conda install -c conda-forge accimage

Model Specific Setup

  • Set Jemalloc Preload for better performance

The tcmalloc should be built from the General setup section.

    export LD_PRELOAD="path/lib/libtcmalloc.so":$LD_PRELOAD
  • Set IOMP preload for better performance

IOMP should be installed in your conda env from the General setup section.

    pip install packaging intel-openmp
    export LD_PRELOAD=path/lib/libiomp5.so:$LD_PRELOAD
  • Set ENV to use fp16 AMX if you are using a supported platform
    export DNNL_MAX_CPU_ISA=AVX512_CORE_AMX_FP16

  • Set ENV to use multi-node distributed training (no need for single-node multi-sockets)

    In this case, we use data-parallel distributed training and every rank will hold same model replica. The NNODES is the number of ip in the HOSTFILE. To use multi-nodes distributed training you should firstly setup the passwordless login (you can refer to link) between these nodes.

    export LOCAL_BATCH_SIZE=#local batch_size(for lars optimizer convergency test, the GLOBAL_BATCH_SIZE should be 3264)
    export NNODES=#your_node_number
    export HOSTFILE=#your_ip_list_file #one ip per line
    export TRAINING_EPOCHS=36 #(optional, this numeber is for lars optimizer convergency test)
    export MASTER_ADDR=#your_master_addr

Run the model

Follow the instructions above to setup your bare metal environment, download and preprocess the dataset, and do the model specific setup. Once all the setup is done, the Intel® AI Reference Models can be used to run a quickstart script. Ensure that you have enviornment variables set to point to the dataset directory, an output directory, precision, and the number of training epochs.

# Clone the Intel® AI Reference Models repo and set the MODEL_DIR
git clone https://github.com/IntelAI/models.git
cd models
export MODEL_DIR=$(pwd)

# Env vars
export DATASET_DIR=<path_to_Imagenet_Dataset>
export OUTPUT_DIR=<Where_to_save_log>
export PRECISION=<precision to run (fp32, avx-fp32, bf16, bf32, or fp16)>
export TRAINING_EPOCHS=<epoch_number(90 or other number)>

# [optional] Compile model with PyTorch Inductor backend
export TORCH_INDUCTOR=1

# Run the training quickstart script
./quickstart/image_recognition/pytorch/resnet50/training/cpu/training.sh
bash training.sh

# Run the distributed training quickstart script
cd ${MODEL_DIR}/quickstart/image_recognition/pytorch/resnet50/training/cpu
bash training_dist.sh

# Run the training single socket throughput script
cd ${MODEL_DIR}/quickstart/image_recognition/pytorch/resnet50/training/cpu
export BATCH_SIZE=102
export TRAINING_EPOCHS=1
bash training_single_socket.sh

License

LICENSE