Cosine Similarity From Scratch

MediumPython

Problem

Write a function to calculate the cosine similarity between two high-dimensional vectors from scratch.

Use equal-length Python lists containing numeric values and return a floating-point similarity score between -1 and 1. If either vector has zero magnitude, return 0.0; do not use NumPy or another vector library.

Constraints

1 <= len(vector_a) == len(vector_b) <= 1000
Each vector value is an integer or floating-point number
Values may be positive, negative, or zero
Return 0.0 when either vector has zero magnitude
Do not use NumPy or another vector-math library

Function Signature

def cosine_similarity(vector_a, vector_b):

CodePython 3

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Run your code to see test output here.