changepy

library0.4.0pypypi✓ verified 88d ago

Changepoint detection on time series in Python. Version 0.4.0 provides algorithms like PELT and binary segmentation for detecting shifts in mean and variance. Low release cadence; last release in 2020.

ai-ml data

pip install changepy

github ↗package ↗

INSTALL

IMPORT

SIG · CHANGEPY

changepy

ai-mlpythonv0.4.0

Install

3.6s avg

Import

254ms

Disk

89MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.4.0 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.236s · 89.4MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 3.6s · import 0.272s · 86MB

89MB installed

● package 89MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

pelt

✓ from changepy import pelt

binseg

✓ from changepy import binseg

Basic usage of PELT changepoint detection on a synthetic time series.

import numpy as np from changepy import pelt # Generate example time series with one changepoint np.random.seed(42) ts = np.concatenate([np.random.normal(0, 1, 50), np.random.normal(5, 1, 50)]) # Detect changepoints changepoints = pelt(ts, penalty=2*np.log(len(ts))) print(changepoints) # Expected: [49] (0-indexed), typically

Debug

Known issues

gotchaThe PELT implementation expects data to be an array-like of floats. Passing integer arrays may cause type errors.

fix

Convert your data to float: arr = np.array(data, dtype=float).

affects: all

deprecatedNo active development since 2020; consider using ruptures for maintained changepoint detection.

fix

Switch to ruptures (pip install ruptures) for more algorithms and active maintenance.

affects: >=0.4.0

Errors

Common errors & fixes

ImportError: cannot import name 'pelt' from 'changepy'

Outdated or incorrect installation; package may not be installed correctly.

fix

Ensure changepy is installed: pip install --upgrade changepy

ValueError: The model must be one of 'mean', 'var', or 'meanvar'.

Using an invalid model argument in pelt() or binseg().

fix

Use one of the allowed string values: 'mean', 'var', or 'meanvar'.

Upgrade

Version history

0.4.0latest on PyPI · released Dec 6, 2023

Audit

Dependencies

No dependency data recorded yet.

Agent activity

18 hits · last 30 days

node

Amazon

OpenAI (training)

Resources

githubhttps://github.com/ruipgil/changepy ↗

packagehttps://pypi.org/project/changepy/ ↗