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Import of run_pipeline not working.

Hi!

I'm just getting started in implementing an algorithm I want to try and just want to log what data I import through my pipeline.
Anyhow, as tutorial shows I should just import the run_pipeline method,

from quantopian.research import run_pipeline  

but this generate the error :

Runtime exception: ImportError: No module named 'quantopian.research'  

Which makes me very confused.

Any help?

2 responses

From the error message it appears you are coding an algorithm in the IDE? The run_pipeline method, and actually the entire module quantopian.research, only applies to the notebook environment. You will get an error if you try to import it into an algorithm (as you noticed). To use pipeline in an algo one only needs the following import

    from quantopian.pipeline import Pipeline

That will get you the Pipeline class definition. The other two methods associated with pipelines that you will use in an algo are attach_pipeline and pipeline_output.

    from quantopian.algorithm import attach_pipeline, pipeline_output

    attach_pipeline(pipeline, 'pipeline')  
    pipeline_data  = pipeline_output('pipeline')  

One doesn't need to actually import these methods however. To make coding more concise these are 'pre-imported' behind the scenes. It's probably good practice though to explicitly do the import to make it a bit more clear where these come from.

Anyway, the issue is the method run_pipeline is only used in notebooks. The similar method pipeline_output is used in algorithms.

Hope that clears it up. If you haven't already check out the pipeline user guide in the docs.

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Ahh I see! Thank you Dan!

Will continue with the documation here on and out!