---
url: >-
  https://adk.nht.io/api/@nhtio/adk/batteries/embeddings/transformers_js/types/type-aliases/TransformersJsPoolingOwner.md
description: >-
  Who applies pooling + L2-normalization: - `'engine'` (default) — the
  transformers.js pipeline pools internally (today's exact behavior). Each
  runtime (node-ONNX vs web-ONNX/WebGPU) pools its own way, contributing to the
  node↔browser vector gap. - `'battery'` — request raw `pooling:'none'` token
  states and pool + normalize in deterministic shared JS (one implementation,
  identical across node + browser), removing post-processing variance and
  leaving only the irreducible ORT-kernel floor. `pooling`/`normalize` then take
  effect in OUR code.
---

# Type Alias: TransformersJsPoolingOwner

```ts
type TransformersJsPoolingOwner = "engine" | "battery";
```

Defined in: [src/batteries/embeddings/transformers\_js/types.ts:59](https://github.com/NHTIO/ADK/blob/v1.20261003.0/src/src/batteries/embeddings/transformers_js/types.ts#L59)

Who applies pooling + L2-normalization:

* `'engine'` (default) — the transformers.js pipeline pools internally (today's exact behavior). Each
  runtime (node-ONNX vs web-ONNX/WebGPU) pools its own way, contributing to the node↔browser vector
  gap.
* `'battery'` — request raw `pooling:'none'` token states and pool + normalize in deterministic shared
  JS (one implementation, identical across node + browser), removing post-processing variance and
  leaving only the irreducible ORT-kernel floor. `pooling`/`normalize` then take effect in OUR code.