code: def test_find_noun_compound_head(self):
      doc = self.nlp("The potassium channel is good.")
  
      head = self.detector.find_noun_compound_head(doc[1])
      assert head == doc[2]
  
      doc = self.nlp("Planting of large plants.")
      head = self.detector.find_noun_compound_head(doc[3])
      # Planting is a noun, but not a compound with 'plants'.
      assert head != doc[0]
      assert head == doc[3]
  
file_path: scispacy/tests/test_hyponym_detector.py
imports: import unittest
  import spacy
  from scispacy.hyponym_detector import HyponymDetector
label_desc: Use image node_id 3 for calling the TestHyponymDetector obj's underlying member method code with example usage: obj.test_find_noun_compound_head() without return types