Code fix

Author: Larry O'Brien

articles/machine-learning/how-to-create-your-first-pipeline.md

@@ -275,7 +275,7 @@ ds_input = my_dataset.as_named_input('input1')
 trainStep = PythonScriptStep(
     script_name="train.py",
     arguments=["--input", ds_input.as_download(), "--output", output_data1],
-    inputs=[ds],
+    inputs=[ds_input],
     outputs=[output_data1],
     compute_target=compute_target,
     source_directory=project_folder