How to do Agglomerative Clustering in Python?
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# How to do Agglomerative Clustering in Python?

This recipe helps you do Agglomerative Clustering in Python

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## Recipe Objective

Have you ever tried to do Agglomerative Clustering in python? Clustering can give us an idea that how the data set is in groups.

So this is the recipe on how we can do Agglomerative Clustering in Python.

## Step 1 - Import the library

``` from sklearn import datasets from sklearn.preprocessing import StandardScaler from sklearn.cluster import AgglomerativeClustering import pandas as pd import seaborn as sns import matplotlib.pyplot as plt ```

We have imported datasets, StandardScaler, AgglomerativeClustering, pandas, and seaborn which will be needed for the dataset.

## Step 2 - Setting up the Data

We have imported inbuilt iris dataset and stored data in x. We have plotted a heatmap for corelation of features. ``` iris = datasets.load_iris() X = iris.data; data = pd.DataFrame(X) cor = data.corr() sns.heatmap(cor, square = True); plt.show() ```

## Step 3 - Training model and Predicting Clusters

Here we we are first standarizing the data by standardscaler. ``` scaler = StandardScaler() X_std = scaler.fit_transform(X) ``` Now we are using AffinityPropagation for clustering with features:

• linkage: It determines which distance to use between sets of observation. The algorithm will merge the pairs of cluster that minimize this criterion.
• n_clusters: It is the number of clusters we want to have
• affinity: In this we have to choose between euclidean, l1, l2 etc.
``` clt = AgglomerativeClustering(linkage="complete", affinity="euclidean", n_clusters=5) ``` We are training the data by using clt.fit and printing the number of clusters. ``` model = clt.fit(X_std) ``` Finally we are predicting the clusters. ``` clusters = pd.DataFrame(model.fit_predict(X_std)) data["Cluster"] = clusters ```

## Step 4 - Visualizing the output

``` fig = plt.figure(); ax = fig.add_subplot(111) scatter = ax.scatter(data,data, c=data["Cluster"],s=50) ax.set_title("Agglomerative Clustering") ax.set_xlabel("X0"); ax.set_ylabel("X1") plt.colorbar(scatter); plt.show() ```

We have plot a sactter plot which will show the clusters of data in different colour.

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