This template creates a file dataset from relative path in datastore in Azure Machine Learning workspace.
{"type": "microsoft.machinelearningservices/workspaces/datasets", "name": "[concat(parameters('workspacename'), "/", parameters('datasetname'))]", "apiversion": "2020-05-01-preview", "location": "[parameters('location')]", "properties": {"skipvalidation": "[parameters('skipvalidation')]", "datasettype": "file", "parameters": {"path": {"datapath": {"relativepath": "[parameters('relativepath')]", "datastorename": "[parameters('datastorename')]"}}}, "registration": {"description": "[parameters('datasetdescription')]", "tags": "[parameters('tags')]"}}} 