# Operator explorer

Search the HELIA adapter inventory by operator, family or **input data type**. Each result lists important constraints and links to the adapter at this documentation's source revision.

A listed type can use an optimized, reference or storage-only path. Shape, weight/output types and build settings still determine whether your model is supported.

How to read type support

- **FP16 arithmetic** needs the matching heliaCORE feature and target support. Storage operations such as `DEQUANTIZE` are different.
- **int4 weights** appear in compute-operator notes. They do not imply int4 activations.
- **Fallback is operator-specific.** Check both allocation and invocation status. See [Model compatibility](https://ambiqai.github.io/helia-rt/guide/model-compatibility/) and [Floating point](https://ambiqai.github.io/helia-rt/guide/floating-point/).
- Operators outside this inventory may come from upstream Reference sources. Registering an operator does not prove that all its types and options are supported.

[Download the complete operator inventory as Markdown](https://ambiqai.github.io/helia-rt/operators.md), including input types, constraints and source links.