Submit child runs from a pipeline step

I would like to submit child runs from within a pipeline step. Specifically, the script in my `PythonScriptStep` has a for-loop to train a model with different parameters. I would like each step in the for-loop to be submitted to a node in my compute cluster. How can I do that? I am thinking I could use [`Run.submit_child()`](https://docs.microsoft.com/en-us/python/api/azureml-core/azureml.core.run(class)?view=azure-ml-py#azureml-core-run-submit-child) inside the for loop to spawn multiple jobs. Is there any guide on how to do so?

先閱讀 issue 中連結的 PythonScriptStep 和 Run.submit_child 文件，然後查看有關從迴圈中提交工作的 pipeline 和計算叢集指南。完成的標準是提供一份清楚的指南，說明是否可以從 pipeline 步驟提交子執行，以及應如何處理所要求的參數掃描。

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