Orchestrate Cohere LLMs with Apache Airflow

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Why use Airflow with Cohere?

• Use Airflow’s data-driven scheduling to run operations with Cohere LLM endpoints based on upstream events in your data ecosystem, like when new user input is ingested or a new dataset is available.
• Send several requests to a model endpoint in parallel based on upstream events in your data ecosystem or user input with Airflow params.
• Add Airflow features like retries and alerts to your Cohere operations. This is critical for day 2 MLOps operations, for example, to handle model service outages.
• Use Airflow to orchestrate the creation of vector embeddings with Cohere models, which is especially useful for very large datasets that can’t be processed automatically by vector databases.

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Time to complete

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Assumed knowledge

• The basics of the Cohere API. See Cohere Documentation.
• The basics of vector embeddings. See the Cohere Embeddings guide.
• Airflow fundamentals, such as writing DAGs and defining tasks. See Get started with Apache Airflow.
• Airflow operators. See Operators 101.
• Airflow hooks. See Hooks 101.

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Prerequisites

• The Astro CLI.
• A Cohere API key. You can generate an API key in the Cohere dashboard, accessible with a Cohere account. A free tier API key is sufficient for this tutorial.

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Step 1: Configure your Astro project

1. Create a new Astro project:
   $ mkdir astro-cohere-tutorial && cd astro-cohere-tutorial
   $ astro dev init
   
2. Add the following lines to your requirements.txt file to install the Cohere Airflow provider and other supporting packages:
   apache-airflow-providers-cohere==1.0.0
   matplotlib==3.8.1
   seaborn==0.13.0
   scikit-learn==1.3.2
   pandas==1.5.3
   numpy==1.26.2
   adjustText==0.8
   
3. To create an Airflow connection to Cohere, add the following environment variables to your .env file. Make sure to provide <your-cohere-api-key>.
   AIRFLOW_CONN_COHERE_DEFAULT='{
       "conn_type": "cohere",
       "password": "<your-cohere-api-key>"
   }'
   

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Step 2: Create your DAG

1. In your dags folder, create a file called recipe_suggestions.py.
2. Copy the following code into the file.
   """
   ## Get recipe suggestions using Cohere's LLMs, embed and visualize the results
   
   This DAG shows how to use the Cohere Airflow provider to interact with the Cohere API.
   The DAG generates recipes based on user input via Airflow params, embeds the
   responses using Cohere embeddings, and visualizes them in 2 dimensions using PCA,
   matplotlib and seaborn.
   """
   
   from airflow.decorators import dag, task
   from airflow.models.param import Param
   from airflow.models.baseoperator import chain
   from airflow.providers.cohere.hooks.cohere import CohereHook
   from airflow.providers.cohere.operators.embedding import CohereEmbeddingOperator
   from sklearn.metrics.pairwise import euclidean_distances
   from sklearn.decomposition import PCA
   from adjustText import adjust_text
   from pendulum import datetime
   import matplotlib.pyplot as plt
   import seaborn as sns
   import pandas as pd
   import numpy as np
   
   
   COHERE_CONN_ID = "cohere_default"
   IMAGE_PATH = "include/recipe_plot.png"
   
   
   @dag(
       start_date=datetime(2023, 11, 1),
       schedule=None,
       catchup=False,
       params={
           "countries": Param(
               ["Switzerland", "Norway", "New Zealand", "Cameroon", "Bhutan", "Chile"],
               type="array",
               title="Countries of recipe origin",
               description="Enter from which countries you would like to get recipes."
               + "List at least two countries.",
           ),
           "pantry_ingredients": Param(
               ["gruyere", "olives", "potatoes", "onions", "pineapple"],
               type="array",
               description="List the ingredients you have in your pantry, you'd like to use",
           ),
           "type": Param(
               "vegetarian",
               type="string",
               enum=["vegan", "vegetarian", "omnivore"],
               description="Select the type of recipe you'd like to get.",
           ),
           "max_tokens_recipe": Param(
               500,
               type="integer",
               description="Enter the max number of tokens the model should generate.",
           ),
           "randomness_of_recipe": Param(
               25,
               type="integer",
               description=(
                   "Enter the desired randomness of the recipe on a scale"
                   + "from 0 (no randomness) to 50 (full randomness). "
                   + "This setting corresponds to 10x the temperature setting in the Cohere API."
               ),
           ),
       },
   )
   def recipe_suggestions():
       @task
       def get_countries_list(**context):
           "Pull the list of countries from the context."
           countries = context["params"]["countries"]
           return countries
   
       @task
       def get_ingredients_list(**context):
           "Pull the list of ingredients from the context."
           ingredients = context["params"]["pantry_ingredients"]
           return ingredients
   
       @task
       def get_a_recipe(
           cohere_conn_id: str, country: str, ingredients_list: list, **context
       ):
           "Get recipes from the Cohere API for your pantry ingredients for a given country."
           type = context["params"]["type"]
           max_tokens_answer = context["params"]["max_tokens_recipe"]
           randomness_of_answer = context["params"]["randomness_of_recipe"]
           co = CohereHook(conn_id=cohere_conn_id).get_conn
   
           response = co.generate(
               model="command",
               prompt=f"Please provide a delicious {type} recipe from {country} "
               + f"that uses as many of these ingredients: {', '.join(ingredients_list)} as possible, "
               + "if you can't find a recipe that uses all of them, suggest an additional desert."
               + "Bonus points if it's a traditional recipe from that country, "
               + "you can name the city or region it's from and you can provide "
               + "vegan alternatives for the ingredients."
               + "Provide the full recipe with all steps and ingredients.",
               max_tokens=max_tokens_answer,
               temperature=randomness_of_answer / 10,
           )
   
           recipe = response.generations[0].text
   
           print(f"Your recipe from {country}")
           print(f"for the ingredients {', '.join(ingredients_list)} is:")
           print(recipe)
   
           with open(f"include/{country}_recipe.txt", "w") as f:
               f.write(recipe)
   
           return recipe
   
       countries_list = get_countries_list()
       ingredients_list = get_ingredients_list()
       recipes_list = get_a_recipe.partial(
           cohere_conn_id=COHERE_CONN_ID, ingredients_list=ingredients_list
       ).expand(country=countries_list)
   
       get_embeddings = CohereEmbeddingOperator.partial(
           task_id="get_embeddings",
           conn_id=COHERE_CONN_ID,
       ).expand(input_text=recipes_list)
   
       @task
       def plot_embeddings(embeddings, text_labels, file_name="embeddings_plot.png"):
           "Plot the embeddings of the recipes."
   
           embeddings = [x[0] for x in embeddings]
           print(text_labels)
   
           pca = PCA(n_components=2)
           reduced_embeddings = pca.fit_transform(embeddings)
   
           plt.figure(figsize=(10, 8))
           df_embeddings = pd.DataFrame(reduced_embeddings, columns=["PC1", "PC2"])
           sns.scatterplot(
               df_embeddings, x="PC1", y="PC2", s=100, color="gold", edgecolor="black"
           )
   
           font_style = {"color": "black"}
           texts = []
           for i, label in enumerate(text_labels):
               texts.append(
                   plt.text(
                       reduced_embeddings[i, 0],
                       reduced_embeddings[i, 1],
                       label,
                       fontdict=font_style,
                       fontsize=15,
                   )
               )
   
           # prevent overlapping labels
           adjust_text(texts, arrowprops=dict(arrowstyle="->", color="red"))
   
           distances = euclidean_distances(reduced_embeddings)
           np.fill_diagonal(distances, np.inf)  # exclude cases where the distance is 0
   
           n = distances.shape[0]
           distances_list = [
               (distances[i, j], (i, j)) for i in range(n) for j in range(i + 1, n)
           ]
   
           distances_list.sort(reverse=True)
   
           legend_handles = []
           for dist, (i, j) in distances_list:
               (line,) = plt.plot(
                   [reduced_embeddings[i, 0], reduced_embeddings[j, 0]],
                   [reduced_embeddings[i, 1], reduced_embeddings[j, 1]],
                   "gray",
                   linestyle="--",
                   alpha=0.3,
               )
               legend_handles.append(line)
   
           legend_labels = [
               f"{text_labels[i]} - {text_labels[j]}: {dist:.2f}"
               for dist, (i, j) in distances_list
           ]
   
           for i in range(len(reduced_embeddings)):
               for j in range(i + 1, len(reduced_embeddings)):
                   plt.plot(
                       [reduced_embeddings[i, 0], reduced_embeddings[j, 0]],
                       [reduced_embeddings[i, 1], reduced_embeddings[j, 1]],
                       "gray",
                       linestyle="--",
                       alpha=0.5,
                   )
   
           plt.legend(
               legend_handles,
               legend_labels,
               title="Distances",
               loc="center left",
               bbox_to_anchor=(1, 0.5),
           )
   
           plt.tight_layout()
           plt.title(
               "2D Visualization of recipe similarities", fontsize=16, fontweight="bold"
           )
           plt.xlabel("PCA Component 1", fontdict=font_style)
           plt.ylabel("PCA Component 2", fontdict=font_style)
   
           plt.savefig(file_name, bbox_inches="tight")
           plt.close()
   
       chain(
           get_embeddings,
           plot_embeddings(
               get_embeddings.output,
               text_labels=countries_list,
               file_name=IMAGE_PATH,
           ),
       )
   
   
   recipe_suggestions()
   

   See all 222 lines
   This DAG consists of five tasks to make a simple MLOps pipeline.
   • The get_ingredients task fetches the list of ingredients that the user found in their pantry and wants to use in their recipe. The input pantry_ingredients param is provided by Airflow params when you run the DAG.
   • The get_countries task uses Airflow params to retrieve the list of user-provided countries to get recipes from.
   • The get_a_recipe task uses the CohereHook to connect to the Cohere API and use the /generate endpoint to get a tasty recipe suggestion based on the user’s pantry ingredients and one of the countries they provided. This task is dynamically mapped over the list of countries to generate one task instance per country. The recipes are saved as .txt files in the include folder.
   • The get_embeddings task uses the CohereEmbeddingOperator to generate vector embeddings of the recipes generated by the upstream get_a_recipe task. This task is dynamically mapped over the list of recipes to retrieve one set of embeddings per recipe. This pattern allows for efficient parallelization of the vector embedding generation.
   • The plot_embeddings task takes the embeddings created by the upstream task and performs dimensionality reduction using PCA to plot the embeddings in two dimensions.
   

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Step 3: Run your DAG

1. Run astro dev start in your Astro project to start Airflow and open the Airflow UI at localhost:8080.
2. In the Airflow UI, run the recipe_suggestions DAG by clicking the play button. Then, provide Airflow params for:
   • Countries of recipe origin: A list of the countries you want to get recipe suggestions from. Make sure to create one line per country and to provide at least two countries.
   • pantry_ingredients: A list of the ingredients you have in your pantry and want to use in the recipe. Make sure to create one line per ingredient.
   • type: Select your preferred recipe type.
   • max_tokens_recipe: The maximum number of tokens available for the recipe.
   • randomness_of_recipe: The randomness of the recipe. The value provided is divided by 10 and given to the temperature parameter of the Cohere API. The scale for the param ranges from 0 to 50, with 0 being the most deterministic and 50 being the most random.
   
3. Go to the include folder to view the image file created by the plot_embeddings task. The image should look similar to the one below.
   

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Step 4: (Optional) Cook your recipe

1. Choose one of the recipes in the include folder.
2. Navigate to your kitchen and cook the recipe you generated using Cohere with Airflow.
3. Enjoy!

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Conclusion