Python Machine Learning Code Snippets Collection
Python Machine Learning Code Snippets
Hierarchical Clustering Example
This snippet demonstrates hierarchical clustering using scipy and visualizes the result as a dendrogram, followed by applying Agglomerative Clustering.
import matplotlib.pyplot as plt
import scipy.cluster.hierarchy as sch
import numpy as np
from sklearn.cluster import AgglomerativeClustering
X = np.random.rand(50, 2)
dendrogram = sch.dendrogram(sch.linkage(X, method='ward'))
plt.title('Dendrogram')
plt.show()
hc = AgglomerativeClustering(Polish Musical Heritage: From Folk Roots to Classical Mastery
I. Polish Traditional Music
General Features and Macroregions
1. General features of Polish traditional music: The National Dance (Polonaise) and Popular Religious Songs (Christmas Carols).
2. Central macroregion of Poland: The strongest and most extensive region, considered the pillar of Polish musical tradition. It features many contrasts, described as “variable melody.” The violin is the most important instrument, and improvisation is common.
3. North-West macroregion of Poland: The polka is
Read MoreSemiconductor Physics and Electronic Circuit Analysis
Hall Effect Fundamentals
The Hall effect is the phenomenon in which a transverse electric field (and hence a potential difference called Hall voltage) is developed across a current-carrying conductor or semiconductor when it is placed in a magnetic field perpendicular to the direction of current.
The Hall Field
The Hall field (EH) is the electric field produced across the width of the conductor due to charge separation caused by the magnetic force on moving charge carriers. It acts perpendicular to
Read MoreTampa Bay Rays Relocate to Abbotsford — White-Cats
Move the Tampa Bay Rays to Abbotsford!
The Fraser Valley White-Cats
I think the Tampa Bay Rays should move to Abbotsford because this city is growing, has many sports fans, and would support a Major League Baseball team.
If the team moves, they should be renamed the Fraser Valley White-Cats. The new name represents the animals and nature of British Columbia.
With a new stadium, new brand, and strong fan support, the Fraser Valley White-Cats would become very popular.
Reasons for the Move
- Abbotsford is
1876 Law Abolishing Basque Fueros Under Alfonso XII
21 July 1876 Law
The text we have this time is a letter in which several articles from a legal law are kept. It deals with the matter of eliminating the Basque Fueros. It was written by the Spanish Courts and the king in force, Alfonso XII, in 1876, after the end of the 3rd Carlist War.
Context of the Carlist Wars
In the 1st Carlist War, Basque people supported Carlists in order to maintain the Fueros. As Carlists were defeated, some reforms were made in those Fueros. After the Glorious Revolution
Read MoreNorthern Ireland Conflict and the Eurozone Monetary Theory
History of Northern Ireland Conflict
The history of Northern Ireland is based on conflict between two main groups: Unionists/Loyalists (mainly Protestant, want to stay in the United Kingdom) and Nationalists/Republicans (mainly Catholic, want to join the Republic of Ireland). The conflict began many centuries ago.
Early Conflicts and Partition
- 1601: The Battle of Kinsale occurred. Irish leaders Hugh O’Neill and Hugh Roe O’Donnell lost against England.
- After this defeat, many Irish leaders left Ireland
Database Normalization: Functional Dependencies and Normal Forms
1. Trivial vs Non-Trivial Dependency
These types describe the basic mathematical relationship between the sets of attributes.
- Trivial Functional Dependency: Occurs when the dependent (RHS) is a subset of the determinant (LHS). It is “trivial” because it doesn’t provide new information.
- Logic: X → Y is trivial if Y ⊆ X.
- Example: {Student_ID, Name} → {Name}.
- Non-Trivial Functional Dependency: Occurs when the dependent is not a subset of the determinant.
- Logic: X → Y is non-trivial if Y ⊄ X.
- Example:
Chemical Composition, Formulas, and the Mole Explained
Compounds Display Constant Composition
Another indicator that can be used to distinguish compounds from mixtures is the proportions of elements.
Law of Constant Composition
The law of constant composition: All samples of a given compound have the same proportions of their constituent elements. Water will always have 1 oxygen for every 2 hydrogen atoms (H2O).
Chemical Formulas: How to Represent Compounds
Chemical formula
Chemical formula: Indicates the elements present in a compound and the relative number
Read MoreUrgent Environmental Issues and Planetary Protection
Environmental Problems: Urgent Action Needed
Environmental problems are becoming more serious today, with issues such as climate change and pollution being among the most critical. Human activities are affecting nature in many ways, and urgent action is needed to protect the planet.
1. Climate Change & Global Warming
Firstly, climate change is caused by carbon emissions and greenhouse gases from fossil fuels. This leads to global warming, which causes heatwaves, flooding, and drought. These extreme
Read MoreOrigins of American National Literature and Early Novelists
The Rise of a National Literature
Debates Over a National Literary Identity
In the early years of the new republic, there was disagreement about how American literature should grow. There were three different points of view. One group was worried that American literature still lacked national feeling and did not want books based on European culture. Another group felt that American literature was too young to declare its independence from the British literary tradition. The third group also felt that
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