Data Analysis Project – Numpy Tutorials for Citizen Data Scientist in Python.
Data Science Project – Machine Learning tutorial on k Nearest Neighbor with Python.
Generating Random Numbers With NumPy Import Numpy import numpy as np Generate A Random Number From The Normal Distribution np.random.normal() 0.5661104974399703 Generate Four Random Numbers From The Normal Distribution np.random.normal(size=4) array([-1.03175853, 1.2867365 , -0.23560103, -1.05225393]) Generate Four Random Numbers From The Uniform Distribution np.random.uniform(size=4) array([ 0.00193123, 0.51932356, 0.87656884, 0.33684494]) Generate Four Random Integers Between 1 …
Formatting Numbers Create A Long Number annual_revenue = 9282904.9282872782 Format Number /* Format rounded to two decimal places */ format(annual_revenue, ‘0.2f’) ‘9282904.93’ /* Format with commas and rounded to one decimal place */ format(annual_revenue, ‘0,.1f’) ‘9,282,904.9’ /* Format as scientific notation */ format(annual_revenue, ‘e’) ‘9.282905e+06’ /* Format as scientific notation rounded to two deciminals */ …
Flatten Lists Of Lists Create A List Of Lists /* Create a list containing three lists of names */ list_of_lists = [[‘Amy’,’Betty’,’Cathryn’,’Dana’], [‘Elizabeth’,’Fay’,’Gora’], [‘Heidi’,’Jane’,’Kayley’]] Flatten The Lists Of Lists Into A Single List /* For each element in list_of_lists, take each element in the list */ flattened_list = [i for row in list_of_lists for i …
Exiting A Loop Create A List /* Create a list: */ armies = [‘Red Army’, ‘Blue Army’, ‘Green Army’] Breaking Out Of A For Loop for army in armies: print(army) if army == ‘Blue Army’: print(‘Blue Army Found! Stopping.’) break Red Army Blue Army Blue Army Found! Stopping. Notice that the loop stopped after the …
Dictionary Basics Basics Not sequences, but mappings. That is, stored by key, not relative position. Dictionaries are mutable. Build a dictionary via brackets unef_org = {‘name’ : ‘UNEF’, ‘staff’ : 32, ‘url’ : ‘http://unef.org’} View the variable unef_org {‘name’: ‘UNEF’, ‘staff’: 32, ‘url’: ‘http://unef.org’} Build a dict via keys who_org = {} who_org[‘name’] = …
Data Structure Basics Lists “A list is a data structure that holds an ordered collection of items i.e. you can store a sequence of items in a list.” – A Byte Of Python Lists are mutable. /* Create a list of countries, then print the results */ allies = [‘USA’,’UK’,’France’,’New Zealand’, ‘Australia’,’Canada’,’Poland’]; allies [‘USA’, ‘UK’, …
Support Vector Classifier There is a balance between SVC maximizing the margin of the hyperplane and minimizing the misclassification. In SVC, the later is controlled with the hyperparameter C, the penalty imposed on errors. C is a parameter of the SVC learner and is the penalty for misclassifying a data point. When C is small, the …
Handling Imbalanced Classes In Logistic Regression Preliminaries /* Load libraries */ from sklearn.linear_model import LogisticRegression from sklearn import datasets from sklearn.preprocessing import StandardScaler import numpy as np Load Iris Flower Dataset /* Load data */ iris = datasets.load_iris() X = iris.data y = iris.target Make Classes Imbalanced /* Make class highly imbalanced by removing first …