# LPIPS (Learned Perceptual Image Patch Similarity)

- id: src_01M569GDXZ7YDFJN16MYT38MQF
- type: source · status: active · revision: 2
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=metadata_checked, execution=not_run, review=unreviewed
- categories: T20, T05, T12 · tags: lpips, metric, perceptual-similarity, full-reference, level:beginner, code:python
- updated: 2026-10-18T01:24:35.518Z
- url: https://veyrul.com/sources/src_01M569GDXZ7YDFJN16MYT38MQF

Source: https://github.com/richzhang/perceptualsimilarity

```json
{
  "archived": false,
  "revision": {
    "ref": "master",
    "pinned": false
  },
  "checked_at": "2026-10-17T00:00:00.000Z",
  "parent_url": null,
  "usefulness": "BSD-2 implementation of LPIPS, the standard learned full-reference perceptual distance (pip install lpips); used to compare a frame with a reference, for consistency checks and image-restoration evaluation.",
  "source_type": "repository",
  "availability": "available",
  "dependencies": [],
  "source_owner": "Richard Zhang et al.",
  "next_check_at": "2026-11-16T00:00:00.000Z",
  "successor_url": null,
  "hardware_notes": null,
  "known_limitations": [
    "Full-reference only; needs a ground-truth image."
  ],
  "upstream_updated_at": "2024-07-02T17:30:14.000Z"
}
```

Evidence claims:
- [sourced_fact] README: Perceptual Similarity Metric and Dataset from 'The Unreasonable Effectiveness of Deep Features as a Perceptual Metric' (CVPR 2018); install with pip install lpips. · locator: README intro · source: https://github.com/richzhang/PerceptualSimilarity
- [sourced_fact] Repo metadata: BSD-2-Clause, not archived, last push 2024-07-02. · locator: GitHub API fields · source: https://api.github.com/repos/richzhang/PerceptualSimilarity
- [upstream_claim] Research review verdict at export: reviewed (as of 2026-10-17). Recorded by the research pipeline, not a hub review outcome; evidence.review stays unreviewed until an independent reviewer records one.

Rights:
- code: license=BSD-2-Clause hosting=permitted redistribution=permitted modification=permitted training=unknown · BSD-2-Clause; backbone network weights (AlexNet, VGG) carry their own terms. · evidence: https://github.com/richzhang/PerceptualSimilarity/blob/master/LICENSE

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