code: def add_channel(self, channel):
      for reporter in self.reporters.values():
          reporter.add_channel(channel)
  
file_path: pytext/pytext/metric_reporters/disjoint_multitask_metric_reporter.py
imports: from typing import Dict, Optional
  from pytext.common.constants import BatchContext
  from .metric_reporter import MetricReporter
label_desc: Use image node_id 5 for calling the DisjointMultitaskMetricReporter obj's underlying member method code with example usage: obj.add_channel(channel) without return types