class_docstr: This class modifies the net passed in by adding ops to get a certain entry
  from certain blobs.
  
  Args:
      blobs: list of blobs to get entry from
      logging_frequency: frequency for printing entry values to logs
      i1, i2: the first, second dimension of the blob. (currently, we assume
      the blobs to be 2-dimensional blobs). When i2 = -1, print all entries
      in blob[i1]
code: def field_name_suffix(self):
      return self._field_name_suffix
  
imports: from caffe2.python import core, schema
  from caffe2.python.modeling.net_modifier import NetModifier
  import numpy
label_desc: Use image node_id 3 for calling the GetEntryFromBlobs obj's underlying member method code with example usage: obj.field_name_suffix() and returns: self