onboarding:Valohai入职示例项目。 熟悉Valohai输入输出，参数和可视化元数据

Valohai入职-示例项目 :shark: :rocket: 先决条件 Python 3和pip 设置 pip3 install valohai-cli vh login 安装Python帮助程序库pip3 install valohai-utils （可选）安装Jupyter Notebook附加组件 pip3 install notebook pip3 install jupyhai jupyhai install 片段 MNIST数据集： ://onboard-sample.s3-eu-west-1.amazonaws.com/tf-sample/mnist.npz default_inputs = { 'mnist' : 'https://onboard-sample.s3-eu-west-1.amazonaws.com/tf-sample/mnist.npz' } 并像valohai