code: def compute(self, today, assets, out, cats):
      out[:] = cats[0]
  
imports: import pandas
  from pandas.util.testing import assert_frame_equal
  from catalyst.pipeline import Pipeline, CustomFactor, CustomFilter, CustomClassifier
  from catalyst.pipeline.data.testing import TestingDataSet
  from catalyst.pipeline.factors.equity import SimpleMovingAverage
  from catalyst.pipeline.filters.smoothing import All
  from catalyst.testing import CatalystTestCase, parameter_space
  from catalyst.testing.fixtures import WithTradingSessions, WithSeededRandomPipelineEngine
  from catalyst.utils.input_validation import _qualified_name
  from catalyst.utils.numpy_utils import int64_dtype
label_desc: Use image node_id 1 for calling the NDaysAgoClassifier obj's underlying member method code with example usage: obj.compute(today, assets, out, cats) without return types