# MobileNetV3Small ImageNet classification. 67.5% top-1 and 87.7% top-5 accuracy.
runtime:
  distribution_strategy: 'tpu'
  mixed_precision_dtype: 'bfloat16'
task:
  model:
    num_classes: 1001
    input_size: [224, 224, 3]
    backbone:
      type: 'mobilenet'
      mobilenet:
        model_id: 'MobileNetV3Small'
        filter_size_scale: 1.0
    norm_activation:
      activation: 'relu'
      norm_momentum: 0.997
      norm_epsilon: 0.001
      use_sync_bn: false
    dropout_rate: 0.2
  losses:
    l2_weight_decay: 0.00001
    one_hot: true
    label_smoothing: 0.1
  train_data:
    input_path: 'imagenet-2012-tfrecord/train*'
    is_training: true
    global_batch_size: 4096
    dtype: 'bfloat16'
  validation_data:
    input_path: 'imagenet-2012-tfrecord/valid*'
    is_training: false
    global_batch_size: 4096
    dtype: 'bfloat16'
    drop_remainder: false
trainer:
  train_steps: 312000  # 1000 epochs
  validation_steps: 13
  validation_interval: 312
  steps_per_loop: 312  # NUM_EXAMPLES (1281167) // global_batch_size
  summary_interval: 312
  checkpoint_interval: 312
  optimizer_config:
    optimizer:
      type: 'rmsprop'
      rmsprop:
        rho: 0.9
        momentum: 0.9
        epsilon: 0.002
    learning_rate:
      type: 'exponential'
      exponential:
        initial_learning_rate: 0.426  # 0.02 * (batch_size / 192)
        decay_steps: 936  # 3 * steps_per_epoch
        decay_rate: 0.99
        staircase: true
    ema:
      average_decay: 0.9999
      trainable_weights_only: false
    warmup:
      type: 'linear'
      linear:
        warmup_steps: 1560
        warmup_learning_rate: 0.0
