class_docstr: A class to output things in GLM passes through arrays of data.
code: def __call__(self, x):
      return self.fn(x)
  
file_path: nipy/nipy/modalities/fmri/fmristat/outputters.py
imports: import numpy
label_desc: Use image node_id 2 for calling the RegressionOutput obj's underlying member method code with example usage: obj.__call__(x) and returns: self