- step:
    name: train-model
    image: tensorflow/tensorflow:0.12.1-devel-gpu
    command: python train.py {parameters}
      - name: training-set-images
        default: https://valohai-mnist.s3.amazonaws.com/train-images-idx3-ubyte.gz
      - name: training-set-labels
        default: https://valohai-mnist.s3.amazonaws.com/train-labels-idx1-ubyte.gz
      - name: test-set-images
        default: https://valohai-mnist.s3.amazonaws.com/t10k-images-idx3-ubyte.gz
      - name: test-set-labels
        default: https://valohai-mnist.s3.amazonaws.com/t10k-labels-idx1-ubyte.gz
      - name: max_steps
        type: integer
        pass-as: --max_steps={v}
        description: Number of steps to run the trainer
        default: 300
      - name: learning_rate
        type: float
        pass-as: --learning_rate={v}
        description: Initial learning rate
        default: 0.001
      - name: dropout
        type: float
        pass-as: --dropout={v}
        description: Keep probability for training dropout
        default: 0.9

This configuration file contains one step called train-model.

The step is run inside the tensorflow/tensorflow:0.12.1-devel-gpu Docker image.

The step contains one command, which runs a Python file named train.py passing it the parameters defined further below.

The step requires four inputs: training-set-images, training-set-labels, test-set-images, test-set-labels. These are the images and labels for both the training and test sets. None of these inputs are optional but all of them have a default source.

The step contains three parameters: max_steps, learning_rate and dropout. None of these parameters are optional but all of them have a default value.