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[tutorial] edited hands-on practices (#1899)  
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model:
  base_learning_rate: 1.0e-04
  target: ldm.models.diffusion.ddpm.LatentDiffusion
  params:
    linear_start: 0.00085
    linear_end: 0.0120
    num_timesteps_cond: 1
    log_every_t: 200
    timesteps: 1000
    first_stage_key: image
    cond_stage_key: caption
    image_size: 32
    channels: 4
    cond_stage_trainable: false   # Note: different from the one we trained before
    conditioning_key: crossattn
    monitor: val/loss_simple_ema
    scale_factor: 0.18215
    use_ema: False
    check_nan_inf: False

    scheduler_config: # 10000 warmup steps
      target: ldm.lr_scheduler.LambdaLinearScheduler
      params:
        warm_up_steps: [ 10000 ]
        cycle_lengths: [ 10000000000000 ] # incredibly large number to prevent corner cases
        f_start: [ 1.e-6 ]
        f_max: [ 1.e-4 ]
        f_min: [ 1.e-10  ]

    unet_config:
      target: ldm.modules.diffusionmodules.openaimodel.UNetModel
      params:
        image_size: 32 # unused
        from_pretrained: '/data/scratch/diffuser/stable-diffusion-v1-4/unet/diffusion_pytorch_model.bin'
        in_channels: 4
        out_channels: 4
        model_channels: 320
        attention_resolutions: [ 4, 2, 1 ]
        num_res_blocks: 2
        channel_mult: [ 1, 2, 4, 4 ]
        num_heads: 8
        use_spatial_transformer: True
        transformer_depth: 1
        context_dim: 768
        use_checkpoint: False
        legacy: False

    first_stage_config:
      target: ldm.models.autoencoder.AutoencoderKL
      params:
        embed_dim: 4
        from_pretrained: '/data/scratch/diffuser/stable-diffusion-v1-4/vae/diffusion_pytorch_model.bin'
        monitor: val/rec_loss
        ddconfig:
          double_z: true
          z_channels: 4
          resolution: 256
          in_channels: 3
          out_ch: 3
          ch: 128
          ch_mult:
          - 1
          - 2
          - 4
          - 4
          num_res_blocks: 2
          attn_resolutions: []
          dropout: 0.0
        lossconfig:
          target: torch.nn.Identity

    cond_stage_config:
      target: ldm.modules.encoders.modules.FrozenCLIPEmbedder
      params:
        use_fp16: True

data:
  target: main.DataModuleFromConfig
  params:
    batch_size: 32
    wrap: False
    train:
      target: ldm.data.pokemon.PokemonDataset
      # params:
        # file_path: "/data/scratch/diffuser/laion_part0/"
        # world_size: 1
        # rank: 0

lightning:
  trainer:
    accelerator: 'gpu' 
    devices: 4
    log_gpu_memory: all
    max_epochs: 2
    precision: 16
    auto_select_gpus: False
    strategy:
      target: pytorch_lightning.strategies.ColossalAIStrategy
      params:
        use_chunk: False
        enable_distributed_storage: True,
        placement_policy: cuda
        force_outputs_fp32: False
        initial_scale: 65536
        min_scale: 1
        max_scale: 65536
        # max_scale: 4294967296

    log_every_n_steps: 2
    logger: True
    default_root_dir: "/tmp/diff_log/"
    profiler: pytorch

  logger_config:
    wandb:
      target: pytorch_lightning.loggers.WandbLogger
      params:
          name: nowname
          save_dir: "/tmp/diff_log/"
          offline: opt.debug
          id: nowname