class_docstr: Module stitches histograms by date
code: def transform(self, hists_basis: dict, hists_delta: dict) -> dict:
      self.logger.info(
          f'Stitching histograms "{self.read_key}" and "{self.delta_key}" as "{self.store_key}"'
      )
      stitched = self.stitch_histograms(
          self.mode, hists_basis, hists_delta
      )
      return stitched
  
file_path: popmon/popmon/stitching/hist_stitcher.py
imports: import histogrammar
  import numpy
  from popmon.analysis.hist_numpy import assert_similar_hists
  from popmon.base import Module
label_desc: Use image node_id 3 for calling the HistStitcher obj's underlying member method code with example usage: obj.transform(hists_basis, hists_delta) and returns: stitched