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Training with Unpaired Data (CycleGAN-turbo)

Here, we show how to train a CycleGAN-turbo model using unpaired data. We will use the horse2zebra dataset introduced by CycleGAN as an example dataset.

Step 1. Get the Dataset

  • First download the horse2zebra dataset from here using the command below.

    bash scripts/download_horse2zebra.sh

  • Our training scripts expect the dataset to be in the following format:

    data
├── dataset_name
│   ├── train_A
│   │   ├── 000000.png
│   │   ├── 000001.png
│   │   └── ...
│   ├── train_B
│   │   ├── 000000.png
│   │   ├── 000001.png
│   │   └── ...
│   └── fixed_prompt_a.txt
|   └── fixed_prompt_b.txt
|
|   ├── test_A
│   │   ├── 000000.png
│   │   ├── 000001.png
│   │   └── ...
│   ├── test_B
│   │   ├── 000000.png
│   │   ├── 000001.png
│   │   └── ...

  • The fixed_prompt_a.txt and fixed_prompt_b.txt files contain the fixed caption used for the source and target domains respectively.

Step 2. Train the Model

  • Initialize the accelerate environment with the following command:

    accelerate config

  • Run the following command to train the model.

    export NCCL_P2P_DISABLE=1
accelerate launch --main_process_port 29501 src/train_cyclegan_turbo.py \
    --pretrained_model_name_or_path="stabilityai/sd-turbo" \
    --output_dir="output/cyclegan_turbo/my_horse2zebra" \
    --dataset_folder "data/my_horse2zebra" \
    --train_img_prep "resize_286_randomcrop_256x256_hflip" --val_img_prep "no_resize" \
    --learning_rate="1e-5" --max_train_steps=25000 \
    --train_batch_size=1 --gradient_accumulation_steps=1 \
    --report_to "wandb" --tracker_project_name "gparmar_unpaired_h2z_cycle_debug_v2" \
    --enable_xformers_memory_efficient_attention --validation_steps 250 \
    --lambda_gan 0.5 --lambda_idt 1 --lambda_cycle 1

  • Additional optional flags:

    • --enable_xformers_memory_efficient_attention: Enable memory-efficient attention in the model.

Step 3. Monitor the training progress

  • You can monitor the training progress using the Weights & Biases dashboard.

  • The training script will visualizing the training batch, the training losses, and validation set L2, LPIPS, and FID scores (if specified).

  • The model checkpoints will be saved in the <output_dir>/checkpoints directory.

Step 4. Running Inference with the trained models

  • You can run inference using the trained model using the following command:

    python src/inference_unpaired.py --model_path "output/cyclegan_turbo/my_horse2zebra/checkpoints/model_1001.pkl" \
    --input_image "data/my_horse2zebra/test_A/n02381460_20.jpg" \
    --prompt "picture of a zebra" --direction "a2b" \
    --output_dir "outputs" --image_prep "no_resize"

  • The above command should generate the following output:

    Model Input Model Output