# Data types by family

This supporting inventory counts  unique function names
from , extracted by the same Doxygen
pipeline as the API reference. Counts include wrappers and scratch-buffer queries,
not just compute kernels. Internal headers and the separate support-function
headers are outside this table's scope.

A function is assigned to the first matching API family. Each numeric tag in its
name contributes to its corresponding column, so a mixed-type function can appear
in more than one column. The **Functions** column counts the name once. Numeric
tags do not describe every argument's type; check the signature for weights, bias,
indices, and output. Column totals therefore must not be added together. The `fp16` spelling is
counted under `f16`.

Return to [Operator coverage](https://ambiqai.github.io/ns-cmsis-nn/guide/coverage/operator-coverage/) to choose an operation.

Family
Functions

All families

## How to read it

- **Nonzero count:** at least one function has this numeric tag. It does not
  establish support for every operation, shape, or accelerated path in the family.
- **Dash:** no declaration in this inventory has that tag. Consult the API
  signature before drawing conclusions about argument types.
- **FP16 and FP32:** declarations are extracted with float APIs enabled. Your
  compiler only sees the declarations allowed by your feature definitions, and
  your library must contain matching implementations.
- **`q7` and `q15`:** inherited fixed-point APIs, with conventions defined by each
  function. They are distinct from the affine quantization of the `s8` APIs.

See [Data types](https://ambiqai.github.io/ns-cmsis-nn/guide/architecture/data-types/) for format selection
and [Build options](https://ambiqai.github.io/ns-cmsis-nn/guide/architecture/build-path-selection/) for
source and feature selection. This inventory describes this documentation build;
it does not inspect the contents of a separately installed prebuilt library.