Only get_embedding once

fd181ec78f 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')"
    ]
   }