class_docstr: Simple FC model
code: def forward(self, x):
      x = self.fc1(x)
      return self.fc2(x)
  
file_path: pytext/pytext/metric_reporters/tests/tensorboard_test.py
imports: from unittest import TestCase
  from pytext.common.constants import Stage
  from pytext.metric_reporters.channel import TensorBoardChannel
  from torch import nn, optim
label_desc: Use image node_id 2 for calling the FCModelWithNanAndInfWts obj's underlying member method code with example usage: obj.forward(x) and returns: self