code: def dimension_type(cls, dataset, dim):
      return dataset.data.dtype.type
  
imports: import numpy
  from ..None import util
  from ..dimension import dimension_name
  from ..element import Element
  from ..ndmapping import NdMapping, item_check, sorted_context
  from .interface import DataError, Interface
label_desc: Use image node_id 1 for calling the ArrayInterface obj's underlying member method code with example usage: obj.dimension_type(cls, dataset, dim) and returns: dataset