[DE-7859] Expose pHash on DatasetItem (v0.18.3)

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to the [Nucleus Python Client](https://github.com/scaleapi/n
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.18.3](https://github.com/scaleapi/nucleus-python-client/releases/tag/v0.18.3) - 2026-05-18
+
+### Added
+- `DatasetItem.phash` field exposing the 64-character "0/1" perceptual-hash string when populated by the Nucleus backend. Available on every SDK method that yields a `DatasetItem` (e.g. `items_and_annotation_generator`, `items_generator`, `query_items`, `dataset.items`, `iloc`/`refloc`/`loc`).
+
 ## [0.18.2](https://github.com/scaleapi/nucleus-python-client/releases/tag/v0.18.2) - 2026-05-08
 
 ### Added

CLAUDE.md

@@ -0,0 +1,52 @@
+# CLAUDE.md
+
+Notes for Claude Code when working in this repo (the Nucleus Python SDK).
+
+## What this repo is
+
+The official Python client for Nucleus. Wraps the `/v1/nucleus` REST endpoints on `scaleapi`. Distributed on PyPI as `scale-nucleus`.
+
+- Sources live under `nucleus/`.
+- Backend lives in the `scaleapi` repo at `server/src/routes/v1/select.ts` and `server/src/lib/select/api/`.
+- The default API base URL is `NUCLEUS_ENDPOINT = "https://api.scale.com/v1/nucleus"` (`nucleus/constants.py`). Override via the `endpoint=` kwarg or `NUCLEUS_ENDPOINT` env var (e.g. point at fedramp).
+
+## Release workflow
+
+Releases are version-numbered with [Semantic Versioning](https://semver.org/) and tracked in `CHANGELOG.md` using the [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) format.
+
+When making a user-facing change, the convention (see PRs #459, #455) is:
+
+1. Bump `version = "..."` in `pyproject.toml` under `[tool.poetry]`. This is the single version source — there is no `__version__` in `nucleus/__init__.py`.
+   - Patch bump for additive, backwards-compatible changes (new fields, new methods).
+   - Minor bump for new features that change behaviour or remove deprecated paths.
+   - Major bump for breaking changes (Python version drops, sentinel removal, etc.).
+2. Prepend a `## [X.Y.Z](https://github.com/scaleapi/nucleus-python-client/releases/tag/vX.Y.Z) - YYYY-MM-DD` section to `CHANGELOG.md` with `### Added` / `### Changed` / `### Fixed` / `### Removed` subsections as appropriate.
+3. Commit the version bump + CHANGELOG entry alongside the code change in the same PR.
+
+Pure refactors / doc-only PRs (#456) sometimes skip the version bump. When in doubt, bump.
+
+## Branch and PR conventions
+
+- Branch naming: `<author>/<kebab-description>` (e.g. `vinayparakala/expose-phash-on-dataset-item`).
+- PR title commonly starts with the Linear ticket: `[DE-XXXX] <description>` — see `git log --oneline -20`.
+- PRs land via squash merge.
+
+## Architecture pointers
+
+- `nucleus/__init__.py` — `NucleusClient`, top-level operations.
+- `nucleus/dataset.py` — `Dataset` class. Most user-facing methods live here (item upload/fetch, generators, queries, slices, autotags, exports). Generators page through the backend via `nucleus/utils.py:paginate_generator`.
+- `nucleus/dataset_item.py` — `DatasetItem` dataclass. **`DatasetItem.from_json` is the single deserialization entry point** for items coming back from the API — every SDK method that returns a `DatasetItem` (generators, queries, `iloc`/`refloc`/`loc`, the `items` property) routes through it. To expose a new server-side field on items, add it to the dataclass + `from_json` and you're done on the SDK side.
+- `nucleus/utils.py` — `convert_export_payload` and `format_dataset_item_response` are the shared shapers used by the export and single-item endpoints. They wrap raw JSON into typed objects via the respective `from_json` classmethods.
+- `nucleus/constants.py` — All API payload keys are constants here. When adding a new field, add a `*_KEY` constant first and reference it from `from_json` / `to_payload` rather than inlining the string.
+- `nucleus/annotation.py`, `nucleus/prediction.py` — Annotation and prediction types. Each has its own `from_json` / `to_payload`.
+
+## Testing
+
+Run the suite from the repo root:
+
+```bash
+poetry install
+poetry run pytest tests
+```
+
+Many tests require a real `NUCLEUS_API_KEY` and hit the live API; use `pytest -k <name>` to scope. Pre-commit hooks (`.pre-commit-config.yaml`) run black, ruff, isort.

nucleus/constants.py

@@ -124,6 +124,7 @@
 OBJECT_IDS_KEY = "object_ids"
 P1_KEY = "p1"
 P2_KEY = "p2"
+PHASH_KEY = "phash"
 POINTS_KEY = "points"
 POINTCLOUD_KEY = "pointcloud"
 POINTCLOUD_LOCATION_KEY = "pointcloud_location"

nucleus/dataset_item.py

@@ -17,6 +17,7 @@
     INDEX_ID_KEY,
     METADATA_KEY,
     ORIGINAL_IMAGE_URL_KEY,
+    PHASH_KEY,
     POINTCLOUD_URL_KEY,
     PROCESSED_URL_KEY,
     REFERENCE_ID_KEY,
@@ -123,6 +124,10 @@ class DatasetItem:  # pylint: disable=R0902
     embedding_info: Optional[DatasetItemEmbeddingInfo] = None
     width: Optional[int] = None
     height: Optional[int] = None
+    # Perceptual hash of the underlying image as a 64-character "0/1" binary
+    # string. Populated by the Nucleus backend on items that have been pHash
+    # backfilled; None for pointcloud items or items without a backfilled hash.
+    phash: Optional[str] = None
 
     def __post_init__(self):
         assert self.reference_id is not None, "reference_id is required."
@@ -178,6 +183,7 @@ def from_json(cls, payload: dict):
             pointcloud_location=pointcloud_url,
             reference_id=payload.get(REFERENCE_ID_KEY),
             metadata=payload.get(METADATA_KEY, {}),
+            phash=payload.get(PHASH_KEY),
         )
 
     def local_file_exists(self):

pyproject.toml

@@ -25,7 +25,7 @@ ignore = ["E501", "E741", "E731", "F401"]  # Easy ignore for getting it running
 
 [tool.poetry]
 name = "scale-nucleus"
-version = "0.18.2"
+version = "0.18.3"
 description = "The official Python client library for Nucleus, the Data Platform for AI"
 license =  "MIT"
 authors = ["Scale AI Nucleus Team <nucleusapi@scaleapi.com>"]