class_docstr: CustomFactor that will be set by populate_initial_workspace.
      
class_docstr_tok: ["CustomFactor","that","will","be","set","by","populate_initial_workspace","."]
code: def compute(self, today, assets, out, col1, col2):
      out[:] = 0.0
  
imports: import itertools
  from operator import attrgetter
  import numpy
  import pandas
  import toolz
  from zipline.pipeline import Pipeline
  from zipline.pipeline.classifiers import Everything
  from zipline.pipeline.domain import US_EQUITIES
  from zipline.pipeline.factors import CustomFactor
  from zipline.pipeline.data import Column, DataSet
  from zipline.pipeline.data.testing import TestingDataSet
  from zipline.pipeline.hooks.testing import TestingHooks
  from zipline.pipeline.hooks.progress import ProgressHooks, repr_htmlsafe, TestingProgressPublisher
  from zipline.pipeline.term import AssetExists, ComputableTerm, LoadableTerm
  from zipline.testing import parameter_space
  from zipline.testing.fixtures import ZiplineTestCase, WithSeededRandomPipelineEngine
  from zipline.testing.predicates import assert_almost_equal, instance_of
label_desc: Use image node_id 1 for calling the PrepopulatedFactor obj's underlying member method code with example usage: obj.compute(today, assets, out, col1, col2) without return types