Only get_embedding once

openai@fd181ec updated what was previously two different get_embedding() calls w/ different models to be two identical calls. Rather than doing the same API call twice in a row, we can now just set the second variable to be equal to the first one.

examples/Obtain_dataset.ipynb

@@ -162,7 +162,7 @@
  "\n",
  "# This will take just between 5 and 10 minutes\n",
  "df['ada_similarity'] = df.combined.apply(lambda x: get_embedding(x, engine='text-embedding-ada-002'))\n",
- "df['ada_search'] = df.combined.apply(lambda x: get_embedding(x, engine='text-embedding-ada-002'))\n",
+ "df['ada_search'] = df['ada_similarity']\n",
  "df.to_csv('data/fine_food_reviews_with_embeddings_1k.csv')"
  ]
  }