input: Write a python function to compare the similarity between two sentences using spaCy.
  assert compare_sentences("The quick brown fox jumps over the lazy dog", "The fast brown fox jumps over the lazy dog") > 0.9
  assert compare_sentences("I love apples", "I love oranges") > 0.5
  assert compare_sentences("The sky is blue", "The ocean is deep") < 0.5
output: import spacy
  
  def compare_sentences(sentence1, sentence2):
      nlp = spacy.load("en_core_web_sm")
      doc1 = nlp(sentence1)
      doc2 = nlp(sentence2)
      return doc1.similarity(doc2)