**Run an Experiment on Azure Machine Learning**
===
NNI supports running an experiment on [AML](https://azure.microsoft.com/en-us/services/machine-learning/) , called aml mode.

## Setup environment
Step 1. Install NNI, follow the install guide [here](../Tutorial/QuickStart.md).   

Step 2. Create an Azure account/subscription using this [link](https://azure.microsoft.com/en-us/free/services/machine-learning/). If you already have an Azure account/subscription, skip this step.

Step 3. Install the Azure CLI on your machine, follow the install guide [here](https://docs.microsoft.com/en-us/cli/azure/install-azure-cli?view=azure-cli-latest).

Step 4. Authenticate to your Azure subscription from the CLI. To authenticate interactively, open a command line or terminal and use the following command:
```
az login
```

Step 5. Log into your Azure account with a web browser and create a Machine Learning resource. You will need to choose a resource group and specific a workspace name. Then download `config.json` which will be used later.
![](../../img/aml_workspace.png)

Step 6. Create an AML cluster as the computeTarget.
![](../../img/aml_cluster.png)

Step 7. Open a command line and install AML package environment.
```
python3 -m pip install azureml
python3 -m pip install azureml-sdk
```

## Run an experiment
Use `examples/trials/mnist-tfv1` as an example. The NNI config YAML file's content is like:

```yaml
authorName: default
experimentName: example_mnist
trialConcurrency: 1
maxExecDuration: 1h
maxTrialNum: 10
trainingServicePlatform: aml
searchSpacePath: search_space.json
#choice: true, false
useAnnotation: false
tuner:
  #choice: TPE, Random, Anneal, Evolution, BatchTuner, MetisTuner, GPTuner
  #SMAC (SMAC should be installed through nnictl)
  builtinTunerName: TPE
  classArgs:
    #choice: maximize, minimize
    optimize_mode: maximize
trial:
  command: python3 mnist.py
  codeDir: .
  computeTarget: ${replace_to_your_computeTarget}
  image: msranni/nni
amlConfig:
  subscriptionId: ${replace_to_your_subscriptionId}
  resourceGroup: ${replace_to_your_resourceGroup}
  workspaceName: ${replace_to_your_workspaceName}

```

Note: You should set `trainingServicePlatform: aml` in NNI config YAML file if you want to start experiment in aml mode.

Compared with [LocalMode](LocalMode.md) trial configuration in aml mode have these additional keys:
* computeTarget
    * required key. The compute cluster name you want to use in your AML workspace. See Step 6.
* image
    * required key. The docker image name used in job. The image `msranni/nni` of this example only support GPU computeTargets.

amlConfig:
* subscriptionId
    * the subscriptionId of your account
* resourceGroup
    * the resourceGroup of your account
* workspaceName
    * the workspaceName of your account

The required information of amlConfig could be found in the downloaded `config.json` in Step 5.

Run the following commands to start the example experiment:
```
git clone -b ${NNI_VERSION} https://github.com/microsoft/nni
cd nni/examples/trials/mnist-tfv1

# modify config_aml.yml ...

nnictl create --config config_aml.yml
```
Replace `${NNI_VERSION}` with a released version name or branch name, e.g., `v1.7`.
