ageron/handson-mlp

[bug] Housing data is not unique by latitude and longitude

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#15 opened on Dec 27, 2025

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Description

Enter the chapter number

Chapter 2

Enter the page number

117

What is the cell's number in the notebook

15

Enter the environment you are using to run the notebook

Jupyter on MacOS

Describe your issue

I don’t think the assumption that each (latitude, longitude) pair is unique is correct.

df["id"] = (df["longitude"] * 1000 + df["latitude"])
df['id'].value_counts()

There are 15 rows with (-122.41;37.8)

Thank you for this great book!

Enter what you expected to happen

No response

If you found a workaround, describe it here

No response

Contributor guide

Research direction
Inspect the code cell to verify the duplicate coordinates and modify the ID generation logic to ensure uniqueness, possibly using a hash or index.
Tech stack
python
Domain
machine learning
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Python
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75