class_docstr: This class modifies the net passed in by adding ops to compute histogram for
  certain blobs.
  
  Args:
      blobs: list of blobs to compute histogram for
      logging_frequency: frequency for printing
      lower_bound: left boundary of histogram values
      upper_bound: right boundary of histogram values
      num_buckets: number of buckets to use in [lower_bound, upper_bound)
      accumulate: boolean to output accumulate or per-batch histogram
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 ComputeHistogramForBlobs obj's underlying member method code with example usage: obj.field_name_suffix() and returns: self