We conduct NAS Following three steps : Supernet design, Single-Path NAS with modification, Scaling and post-processing.

We depict our search results on MIDAP below. Height of each block in the picture is proportional to expansion ratio. SE-applied blocks are depicted as dotted blocks.

• Access to Cloud TPUs (Official Cloud TPU Tutorial)
• Tensorflow 1.15.3 for TPU, 1.13 for GPU
• Python 3.5+
• python-box 3.4.6

1. Set up ImageNet dataset

   To setup the ImageNet follow the instructions from here

   Or you can just copy from other bucket using gsutil -m cp -r, or transfer from other bucket.

2. Set up the profiled latency files

   latency_folder
   |-- Conv2D
   |-- Dense
   |-- GlobalAvgPool
   |-- MBConvBlock
   |-- MixConvBlock
       |-- r1_k3,5_s22_e2,4_i32_o32_c100_noskip_relu_imgsize112
       |-- ...
   

   each latency file contains a dictionary with latency value. For example, the content of r1_k3,5_s22_e2,4_i32_o32_c100_noskip_relu_imgsize112 may be {"latency": 364425}

   For blocks, imgsize indicate width/height of input image of the block. Activation function is set to be relu as default. For more information, refer latency_estimator.py and blockargs.py.

   For other components, the file name rule is similar, you can refer to get_str ftns of each BasicOps. refer block_ops.py

   to use our profiled latency files for MIDAP, please type

   git submodule update --init --recursive
   

3. Set up flags and run

   Refer to the script files in base_experiment_scripts, or set up flags yourself. When you use scripts in base_experiment_scripts, please MODIFY

   • Google Cloud Storage Bucket
   • Model file name
   • Google Cloud TPU name
   • Target latency
   • Latency folder name --constraint_lut_folder=XXX

   We provide script templates for NAS / train / post_process

4. Run the script file.

• When running on Multi-GPU, set --moving_average_decay=0.0

  Multi-GPU in TF 1.x does not support tf.train.ExponentialMovingAverage. refer

• When running on GPU, set --use_tpu=False --transpose_input=False

• Setting --use_cache=False can reduce memory usage.

• We didn't check the validity on GPU environment.

If it helps your research, please cite

@misc{lee2020s3nas,
    title={S3NAS: Fast NPU-aware Neural Architecture Search Methodology},
    author={Jaeseong Lee and Duseok Kang and Soonhoi Ha},
    year={2020},
    eprint={2009.02009},
    archivePrefix={arXiv},
    primaryClass={cs.LG}
}