docstr: Return recall for a given precision
code: def recall_at_precision(self, precision, label=None):
      """Return recall for a given precision"""
      if label:
          label_id = self.f.get_label_id(label)
          recall = self.m.recallAtPrecisionLabel(label_id, precision)
      else:
          recall = self.m.recallAtPrecision(precision)
  
      return recall
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  import fasttext_pybind
  import numpy
  import multiprocessing
  import sys
  from itertools import chain
label_desc: Use image node_id 5 for calling the _Meter obj's underlying member method code with example usage: obj.recall_at_precision(precision, label) and returns: recall