prefixspan

library0.5.2pypypi✓ verified 86d ago

PrefixSpan is a Python 3 library for sequential pattern mining, implementing PrefixSpan, BIDE, and FEAT algorithms. Current version is 0.5.2, with infrequent releases.

analytics

pip install prefixspan

github ↗homepage ↗

INSTALL

IMPORT

SIG · PREFIXSPAN

prefixspan

analyticspythonv0.5.2

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

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

PrefixSpan

✓ from prefixspan import PrefixSpan

✗ from prefixspan import prefixspan

Class name is case-sensitive; wrong casing causes ImportError.

Basic example: finding top-5 frequent sequential patterns.

from prefixspan import PrefixSpan db = [ [1, 2, 3, 4], [1, 2, 4], [1, 3, 4], [2, 3, 4], ] ps = PrefixSpan(db) patterns = ps.topk(5) print(patterns) # [(4, 4), (2, 3), (3, 3), (4, 3), (1, 3)]

Debug

Known issues

deprecatedThe 'minlen' parameter in PrefixSpan methods is deprecated. Use 'min_len' instead.

fix

Replace minlen=2 with min_len=2.

affects: >=0.5.0

breakingThe result format changed in version 0.5.0: patterns are now sorted by support descending, then by pattern length, then lexicographically.

fix

If you relied on a specific order, sort results explicitly.

affects: >=0.5.0

gotchaThe library expects sequences as lists of integers (or hashable items). Strings may cause unexpected behavior if not consistent.

fix

Ensure all items in sequences are the same type and hashable.

affects: all

Errors

Common errors & fixes

ImportError: cannot import name 'PrefixSpan' from 'prefixspan'

Wrong import: using lowercase 'prefixspan' instead of 'PrefixSpan'.

fix

Use: from prefixspan import PrefixSpan

ValueError: minlen is deprecated, use min_len

Using the deprecated 'minlen' parameter.

fix

Change to min_len parameter.

TypeError: unhashable type: 'list'

Items in sequences are lists instead of hashable elements.

fix

Convert inner lists to tuples or use hashable items.

Upgrade

Version history

0.5.2latest on PyPI · released Sep 29, 2018

Audit

Dependencies

No dependency data recorded yet.

Agent activity

34 hits · last 30 days

node

Amazon

OpenAI (training)

Resources

githubhttps://github.com/chuanconggao/PrefixSpan-py ↗

homepagehttps://github.com/chuanconggao/PrefixSpan-py ↗