Call Web Service to Extract Images

October 22, 2016

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This experiment shows how to plot using ggplot2, and how to call this in RRS mode and extract images from the output base-64 encoded strings
This experiment has an Execute R Script module that creates 4 plots using ggplot2 library. You can see the plots by visualizing the 2nd output port of the Execute R Script module. After deploying a web service out of this predictive experiment, you can then use the following PowerShell scripts to call the RRS endpoint and save the images as 4 png files locally. Import-Module AzureMLPS.dll $url = '**RRS Endpoint URL**' $key = '**API Key**' $saveToDir = 'c:\temp\' # This web service has no input $input = '{}' # output in JSON format $output = Invoke-AmlWebServiceRRSEndpoint -ApiLocation $url -ApiKey $key -InputJsonText $input # convert to JSON object $x1 = ConvertFrom-Json -InputObject $output # get the inner JSON string from "output1" $x2 = $x1.Results.output1.value.Values[0][0] # convert to JSON object $x3 = ConvertFrom-Json -InputObject $x2 # get the actual outputs: 0 is StdOut, 1 is StdErr, and 2 is Graphics Device $x4 = $x3.sections[2].values # save all plots to "c:\temp\n.png" where n = 1 to 4. for ($i = 0; $i -lt $x4.Length; $i++) { [io.file]::WriteAllBytes($saveToDir + $i.ToString() + '.png', [System.Convert]::FromBase64String($x4[$i].data)) } To get the Azure ML Studio PowerShell Module, visit [http://aka.ms/amlps](http://aka.ms/amlps). You can also do this in C#/Python/R etc.