code: def forward(self):
      if self.count is None:
          self.count = 0
      else:
          self.count += 1
      return self.count
  
file_path: tensortrade/tests/tensortrade/unit/feed/core/test_base.py
imports: from tensortrade.feed.core import Stream, NameSpace
  from tensortrade.feed.core.base import Placeholder
label_desc: Use image node_id 2 for calling the Counter obj's underlying member method code with example usage: obj.forward() and returns: self