com.microsoft.VarlenCausalConvWithState

com.microsoft · ONNX Runtime contrib operator · contrib since_version 1

Description

Stateful causal depthwise convolution over packed token-major variable-length sequences, without reads across sequence boundaries. initial_state carries preceding raw samples and final_state is fully written. At positive state_update_capacity, capture_count selects a clamped prefix of raw input tokens for compact state_update; inactive slots are zero. SiLU and Swish are aliases. This implementation supports float16 and float32 with float32 accumulation; bfloat16 is not implemented.

See the ONNX Runtime VarlenCausalConvWithState contrib-operator spec for the reference semantics.

Inputs

Name	Bind key	Logical dtype	WebGPU storage	Rank	Shape	Description	Presence
`input`	`inputT`	`T`	same as logical dtype	`2`	—	Token-major packed input with shape `(total_tokens, channels)`.	required
`weight`	`weightT`	`T`	same as logical dtype	`3`	—	Depthwise kernel with shape `(channels, 1, kernel_size)`.	required
`cumulative_sequence_length`	`cumulativeSequenceLengthT`	`M`	`int32`	`1`	—	Exclusive prefix sums with shape `(batch_size + 1)`; sequence `i` owns tokens `[cum[i], cum[i + 1])`.	required
`bias`	`biasT`	`T`	same as logical dtype	`1`	—	Optional per-channel bias with shape `(channels,)`. In an ONNX graph an omitted bias must still occupy input index 3 as an empty name so `initial_state` stays at index 4.	optional
`initial_state`	`initialStateT`	`T`	same as logical dtype	`3`	—	Required committed carry state with shape `(batch_size, channels, kernel_size - 1)`, holding the raw samples immediately preceding this call.	required
`capture_count`	`captureCountT`	`M`	`int32`	`1`	—	Optional int32 vector with shape `(batch_size)`. Required exactly when `state_update_capacity` is positive; each value is clamped to `[0, min(state_update_capacity, sequence_length)]`.	optional

Outputs

Name	Bind key	Logical dtype	Rank	Shape	Description	Presence
`output`	`outputT`	`T`	same as `input`	same as `input`	Convolution output with the same shape as `input`.	required
`final_state`	`finalStateT`	`T`	`3`	derived; see description	State after each sequence's final token, shape `(batch_size, channels, kernel_size - 1)`. Always fully written.	required
`state_update`	`stateUpdateT`	`T`	`3`	derived; see description	Optional compact transition values with shape `(batch_size, state_update_capacity, channels)`. Active slots contain the original local input tokens and all other slots are zero.	optional

Attributes

Default values (overridable per request):

Attribute	Default	Description
`activation`	`"none"`	Fused activation applied after convolution and bias. One of `none`, `silu`, or `swish`; the standard default is `none`.
`state_update_capacity`	`0`	Static number of compact per-request prefix transition values to expose, in `[0, 8]`. The standard default is 0.

Type constraints

Variable	Allowed dtypes
`T`	`float32`, `float16`
`M`	`int32`

Files

metadata.json — kernel metadata (id, digests, provenance)
manifest.json — the op contract (source of truth)
test.json — correctness cases
bench.json — benchmark + tuning cases
varlen-causal-conv-stream.wgsl.jinja
varlen-causal-conv.wgsl.jinja
varlen-state-update.wgsl.jinja

Use with `@huggingface/kernels`

The loader derives every required output's shape and logical dtype from the manifest contract and this call. It then allocates the result tensors automatically.

The version: 1 option selects the published kernel contract; it is independent of any operator opset, contrib since_version, or model version.

Replace each *Data placeholder with a typed array containing the corresponding input data.

import { getKernel } from "@huggingface/kernels";

const kernel = await getKernel("webgpu-kernels/com.microsoft.VarlenCausalConvWithState", { version: 1 });
const { outputT, finalStateT } = await kernel({
  inputT: { data: inputTData, shape: [5, 6] },
  weightT: { data: weightTData, shape: [6, 1, 4] },
  cumulativeSequenceLengthT: { data: cumulativeSequenceLengthTData, shape: [3] },
  initialStateT: { data: initialStateTData, shape: [2, 6, 3] },
});

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kernel

webgpu

wgsl

apache-2.0

WebGPU

Requires WebGPU support. See the compatibility table.