Visualisasi t-SNE pada himpunan data biji-bijian

Dalam video, Anda melihat t-SNE diterapkan pada himpunan data iris. Pada latihan ini, Anda akan menerapkan t-SNE pada data sampel biji-bijian dan meninjau fitur t-SNE yang dihasilkan menggunakan scatter plot. Anda diberikan array samples berisi sampel biji-bijian dan sebuah daftar variety_numbers yang memberikan nomor varietas untuk setiap sampel biji-bijian.

Latihan ini adalah bagian dari kursus

Unsupervised Learning in Python

Petunjuk latihan

Impor TSNE dari sklearn.manifold.
Buat instance TSNE bernama model dengan learning_rate=200.
Terapkan metode .fit_transform() dari model pada samples. Beri nama hasilnya tsne_features.
Pilih kolom 0 dari tsne_features. Beri nama hasilnya xs.
Pilih kolom 1 dari tsne_features. Beri nama hasilnya ys.
Buat scatter plot dari fitur t-SNE xs dan ys. Untuk mewarnai titik berdasarkan varietas biji-bijian, tentukan argumen kata kunci tambahan c=variety_numbers.

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

# Import TSNE
____

# Create a TSNE instance: model
model = ____

# Apply fit_transform to samples: tsne_features
tsne_features = ____

# Select the 0th feature: xs
xs = tsne_features[:,0]

# Select the 1st feature: ys
ys = tsne_features[:,1]

# Scatter plot, coloring by variety_numbers
____
plt.show()

Edit dan Jalankan Kode

Latihan ini adalah bagian dari kursus

Unsupervised Learning in Python

SkillTag.level.intermediateSkillTag.label

4.8+

Mulai Kursus Gratis

Learn how to discover the underlying groups (or "clusters") in a dataset. By the end of this chapter, you'll be clustering companies using their stock market prices, and distinguishing different species by clustering their measurements.

Exercise 1: Unsupervised Learning Exercise 2: How many clusters?Exercise 3: Clustering 2D points Exercise 4: Inspect your clustering Exercise 5: Evaluating a clustering Exercise 6: How many clusters of grain?Exercise 7: Evaluating the grain clustering Exercise 8: Transforming features for better clusterings Exercise 9: Scaling fish data for clustering Exercise 10: Clustering the fish data Exercise 11: Clustering stocks using KMeans Exercise 12: Which stocks move together?

In this chapter, you'll learn about two unsupervised learning techniques for data visualization, hierarchical clustering and t-SNE. Hierarchical clustering merges the data samples into ever-coarser clusters, yielding a tree visualization of the resulting cluster hierarchy. t-SNE maps the data samples into 2d space so that the proximity of the samples to one another can be visualized.

Exercise 1: Memvisualisasikan hierarki Exercise 2: Berapa banyak penggabungan?Exercise 3: Hierarchical clustering pada data biji-bijian Exercise 4: Hierarki saham Exercise 5: Label klaster dalam hierarchical clustering Exercise 6: Klaster mana yang paling dekat?Exercise 7: Linkage berbeda, hierarchical clustering berbeda!Exercise 8: Pengelompokan menengah Exercise 9: Mengekstrak label klaster Exercise 10: t-SNE untuk peta 2 dimensi Exercise 11: Visualisasi t-SNE pada himpunan data biji-bijian

Latihan Saat Ini

Exercise 12: Peta t-SNE pasar saham

Dimension reduction summarizes a dataset using its common occuring patterns. In this chapter, you'll learn about the most fundamental of dimension reduction techniques, "Principal Component Analysis" ("PCA"). PCA is often used before supervised learning to improve model performance and generalization. It can also be useful for unsupervised learning. For example, you'll employ a variant of PCA will allow you to cluster Wikipedia articles by their content!

Exercise 1: Visualizing the PCA transformation Exercise 2: Correlated data in nature Exercise 3: Decorrelating the grain measurements with PCA Exercise 4: Principal components Exercise 5: Intrinsic dimension Exercise 6: The first principal component Exercise 7: Variance of the PCA features Exercise 8: Intrinsic dimension of the fish data Exercise 9: Dimension reduction with PCA Exercise 10: Dimension reduction of the fish measurements Exercise 11: A tf-idf word-frequency array Exercise 12: Clustering Wikipedia part I Exercise 13: Clustering Wikipedia part II

In this chapter, you'll learn about a dimension reduction technique called "Non-negative matrix factorization" ("NMF") that expresses samples as combinations of interpretable parts. For example, it expresses documents as combinations of topics, and images in terms of commonly occurring visual patterns. You'll also learn to use NMF to build recommender systems that can find you similar articles to read, or musical artists that match your listening history!

Exercise 1: Non-negative matrix factorization (NMF)Exercise 2: Non-negative data Exercise 3: NMF applied to Wikipedia articles Exercise 4: NMF features of the Wikipedia articles Exercise 5: NMF reconstructs samples Exercise 6: NMF learns interpretable parts Exercise 7: NMF learns topics of documents Exercise 8: Explore the LED digits dataset Exercise 9: NMF learns the parts of images Exercise 10: PCA doesn't learn parts Exercise 11: Building recommender systems using NMF Exercise 12: Which articles are similar to 'Cristiano Ronaldo'?Exercise 13: Recommend musical artists part I Exercise 14: Recommend musical artists part II Exercise 15: Final thoughts