code: def accumulation_dimensions(nacc, nobs):
      """Set dimensions for the accumulated products."""
      return {
          "accumulations": nacc,
          "pixels": nobs,
      }
  
imports: from datetime import datetime
  import numpy
  import xarray
  from satpy.tests.reader_tests.test_netcdf_utils import FakeNetCDF4FileHandler
label_desc: Use image node_id 8 for calling a global function with example usage: accumulation_dimensions(nacc, nobs) and returns: dict