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Kizzasi is a Rust-native AGSP designed for continuous signal streams—audio, sensor data, robotics control signals, and video frames. Unlike traditional LLMs that operate on discrete text tokens, Kizzasi is built for the continuous domain.

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# Kizzasi (兆し)

**Autoregressive General-Purpose Signal Predictor (AGSP)**

[![Crates.io](https://img.shields.io/crates/v/kizzasi.svg)](https://crates.io/crates/kizzasi)
[![Documentation](https://docs.rs/kizzasi/badge.svg)](https://docs.rs/kizzasi)
[![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](https://raw.githubusercontent.com/cool-japan/kizzasi/master/LICENSE)
[![Rust](https://img.shields.io/badge/rust-1.89%2B-orange.svg)](https://www.rust-lang.org/)

*"Predicting the flux of the world with the precision of logic."*

---

## Overview

**Kizzasi** (Japanese: 兆し, meaning "sign/omen/premonition") is a Rust-native autoregressive predictor designed for **continuous signal streams**—audio waveforms, sensor data, robotics control signals, and video frames. Unlike traditional Large Language Models (LLMs) that operate on discrete text tokens, Kizzasi is purpose-built for the continuous domain.

### The AGSP Paradigm

The term "Language Model" is a misnomer—what we actually have are **General-Purpose Signal Predictors**. Kizzasi embraces this insight:

- **Text tokens** are just one type of signal (discrete vocabulary indices)
- **Audio samples** are continuous signals (44.1kHz waveforms)
- **Sensor readings** are multivariate time series
- **Video frames** are high-dimensional spatial-temporal signals

All these modalities can be processed by the same autoregressive architecture: *predict the next value(s) based on history*.

### Core Innovation: Neuro-Symbolic Architecture

Kizzasi combines the **learning capability** of State Space Models (Mamba/RWKV/S4) with the **strict reliability** of TensorLogic constraints. This ensures predicted signals:

1. Follow statistical likelihoods (learned from data)
2. Adhere to physical laws (conservation, causality)
3. Respect safety constraints (bounds, rate limits)
4. Satisfy logical rules (domain-specific requirements)

---

## Architecture

```
┌─────────────────────────────────────────────────────────────────────────────────┐
│                                    kizzasi                                       │
│                              (Unified Facade API)                                │
├─────────────┬──────────────┬──────────────┬──────────────┬──────────────────────┤
│ kizzasi-    │  kizzasi-    │  kizzasi-    │  kizzasi-    │     kizzasi-io       │
│   core      │    model     │  tokenizer   │  inference   │  (World Connectors)  │
│  (Engine)   │   (Archs)    │  (Encoding)  │  (Pipeline)  │                      │
├─────────────┴──────────────┴──────────────┴──────────────┤                      │
│                       kizzasi-logic                       │                      │
│                  (Constraint Enforcement)                 │                      │
├───────────────────────────────────────────────────────────┴──────────────────────┤
│                            COOLJAPAN Ecosystem                                   │
│            scirs2-core  |  scirs2-signal  |  tensorlogic  |  candle              │
└──────────────────────────────────────────────────────────────────────────────────┘
```

### System Overview

```mermaid
graph TB
 subgraph Input["Signal Input Layer"]
 IO[kizzasi-io WebSocket/MQTT/Audio/Serial]
 end
 subgraph Token["Tokenization Layer"]
 TOK[kizzasi-tokenizer VQ-VAE / μ-law / Perceptual / PEAQ]
 end
 subgraph Core["Core SSM Engine"]
 CORE[kizzasi-core SIMD / Parallel Scan / GPU]
 end
 subgraph Models["Model Layer"]
 MB[Mamba]
 MB2[Mamba2]
 RW[RWKV v6/v7]
 S4[S4D]
 TR[Transformer]
 end
 subgraph Infer["Inference Layer"]
 INF[kizzasi-inference gRPC / REST / WebSocket]
 end
 subgraph Logic["Constraint Layer"]
 LOG[kizzasi-logic LTL / STL / MPC]
 end
 IO --> TOK --> CORE --> Models --> INF
 LOG --> INF
```

### Mamba SSM Forward Pass

```mermaid
flowchart LR
    X["x_t (input)"] --> PROJ["Linear Projection"]
    PROJ --> DELTA["Δ (timescale)"]
    PROJ --> B["B (input gate)"]
    PROJ --> C["C (output gate)"]
    DELTA --> DISC["ZOH Discretization\nA_bar, B_bar"]
    H_PREV["h_{t-1} (state)"] --> SSM
    DISC --> SSM["SSM Recurrence\nh_t = A_bar·h + B_bar·x"]
    B --> SSM
    SSM --> H_NEXT["h_t (new state)"]
    C --> OUT["Output\ny_t = C·h_t"]
    SSM --> OUT
```

### Inference Pipeline

```mermaid
sequenceDiagram
    participant Client
    participant REST/gRPC
    participant InferenceEngine
    participant Model
    participant Constraints

Client->>REST/gRPC: POST /infer {signal: [...]}
    REST/gRPC->>InferenceEngine: infer(request)
    InferenceEngine->>Model: step(token)
    Model-->>InferenceEngine: prediction
    InferenceEngine->>Constraints: check(prediction)
    Constraints-->>InferenceEngine: projection(prediction)
    InferenceEngine-->>REST/gRPC: response
    REST/gRPC-->>Client: {prediction: [...]}
```

### Training Data Flow

```mermaid
flowchart TD
 DATA["Training Data (time series)"] --> TOK["Tokenizer"]
 TOK --> BATCH["DataLoader (batched sequences)"]
 BATCH --> FWD["Forward Pass (SSM model)"]
 FWD --> LOSS["Loss Computation (prediction + constraint)"]
 LOSS --> BWD["Backward Pass (SSM gradients)"]
 BWD --> OPT["Optimizer (AdamW / SGD)"]
 OPT --> CKPT["Checkpoint (JSON / SafeTensors)"]
 OPT --> FWD
```

### Crate Structure

| Crate | Description | Status | SLoC |
|-------|-------------|:------:|------|
| [`kizzasi`](crates/kizzasi) | Unified facade with prelude and ergonomic API | Stable | ~8,200 |
| [`kizzasi-core`](crates/kizzasi-core) | SSM engine, embeddings, SIMD optimizations, parallel scan | Stable | ~19,800 |
| [`kizzasi-model`](crates/kizzasi-model) | Mamba/Mamba2, RWKV v5/v6/v7, S4/S4D, Transformer + training | Stable | ~35,800 |
| [`kizzasi-tokenizer`](crates/kizzasi-tokenizer) | VQ-VAE, μ-law, quantizers, multi-scale tokenization; multi-speaker, perceptual (Bark-scale), PEAQ quality evaluation | Stable | ~17,500 |
| [`kizzasi-inference`](crates/kizzasi-inference) | Pipeline orchestration, sampling, batching, gRPC/REST | Stable | ~12,600 |
| [`kizzasi-logic`](crates/kizzasi-logic) | Constraints, guardrails, projections, LTL/STL | Stable | ~21,400 |
| [`kizzasi-io`](crates/kizzasi-io) | MQTT, Audio, WebSocket, Serial, File, DSP, Beamforming, pure-Rust video (`video-pure`) | Stable | ~22,800 |
| [`kizzasi-embedded`](crates/kizzasi-embedded) | no_std SSM inference for edge devices | Stable | ~2,400 |
| [`kizzasi-python`](crates/kizzasi-python) | Python bindings via PyO3/maturin | Alpha | ~3,200 |
| [`kizzasi-macros`](crates/kizzasi-macros) | Procedural macros for compile-time config | Stable | ~1,050 |
| [`kizzasi-metal`](crates/kizzasi-metal) | Target-gated activation of candle's Apple Metal backend | Stable | ~60 |
| [`kizzasi-webgpu`](crates/kizzasi-webgpu) | WebGPU/WGSL GPU acceleration kernels (SSM scan, matvec, SiLU, RMS-norm) | Alpha | ~2,500 |

**Total: ~147,000+ lines of Rust code across 438 source files**

`Stable` crates are feature-complete and well-tested; `Alpha` crates (kizzasi-python, kizzasi-webgpu) are functional with test coverage but their APIs may still change.

---

## Installation

Add to your `Cargo.toml`:

```toml
[dependencies]
kizzasi = "0.2"
```

### Feature Flags

| Feature | Description | Default |
|---------|-------------|:-------:|
| `std` | Standard library support | ✓ |
| `full` | Enable all features below | ✓ |
| `io` | Physical world connectors | ✓ |
| `logic` | TensorLogic constraints | ✓ |
| `mqtt` | MQTT client over plain TCP (rumqttc) | ✓ |
| `async` | Async/streaming support (tokio) | ✓ |
| `config-files` | TOML/YAML config loading | ✓ |
| `macros` | `#[derive(KizzasiConfig)]` and friends (kizzasi-macros) | ✓ |
| `webgpu` | GPU SSM scan via `kizzasi-webgpu` (wgpu: Metal/Vulkan/DX12) | ○ |
| `metal` | candle Metal backend, live on Apple targets only (propagates to kizzasi-core) | ○ |
| `audio` | Live audio device I/O via cpal — **links a C library** (see below) | ○ |

All of the above default-on features are pulled in transitively through `full`, which is itself part of `default`. The lower-level `kizzasi-model` crate has its own architecture features (`mamba`, `rwkv`, `s4`, `transformer`, all default-on there) for the standalone model implementations used via `kizzasi-inference`'s registry — they are not features of the `kizzasi` facade crate itself.

### Pure Rust: what is and is not in the default build

The default build compiles no C/C++/Fortran of kizzasi's own choosing. Everything that needs a native library is opt-in and named as such:

| Feature | Crate | Native library it pulls in |
|---------|-------|----------------------------|
| `audio` | `kizzasi-io` | cpal → `alsa-sys`/libasound on Linux (CoreAudio via objc2 on Apple, WASAPI on Windows) |
| `video` | `kizzasi-io` | `ffmpeg-next` → the FFmpeg libraries |
| `qp-solver` | `kizzasi-logic` | `osqp` → the OSQP C solver |
| `hf-hub` | `kizzasi-model` | reqwest → rustls → `aws-lc-sys` |

`hdf5` is no longer in this table: it now depends on [`oxih5`](https://crates.io/crates/oxih5), a
pure-Rust HDF5 reader/writer, so it compiles no C at all (the old `hdf5` crate → libhdf5 binding is
gone).

`kizzasi-io` also has a pure-Rust alternative to `video`: the opt-in `video-pure` feature (the
OxiMedia stack) decodes Y4M files and captures from cameras with no C linked at all, so it is
deliberately not a row in the table above. See `crates/kizzasi-io/README.md`'s Cargo Feature Flags
table for exactly what it does and does not decode.

The default build compiles no C at all -- for anyone depending on the published crates, not just inside this workspace. The last holdout was the tensor backend: upstream `candle-core`'s mandatory `tokenizers` dependency selects the `onig` feature, pulling in Oniguruma (`onig`/`onig_sys`, a C regex library), with no configuration lever inside kizzasi to drop it -- candle-core was already built with `default-features = false` here.

kizzasi therefore depends on [`oxicandle-core`](https://crates.io/crates/oxicandle-core) and [`oxicandle-nn`](https://crates.io/crates/oxicandle-nn), the COOLJAPAN fork of candle 0.11.0, which selects `tokenizers`'s pure-Rust `fancy-regex` backend instead (upstream candle PR #3790). The fork keeps the upstream library names, so `use candle_core::…` is unchanged and no kizzasi source file differs because of it. `deny.toml` bans `onig`/`onig_sys` outright, so a regression fails the build rather than passing quietly.

An earlier revision handled this with a `[patch.crates-io]` entry pointing at a sibling candle checkout. That was dropped because it only ever fixed the build *here*: `[patch]` does not propagate to crates.io, so consumers of a published kizzasi crate still compiled `onig`. If you want to check the property that actually matters, check it from outside this workspace, against the published crate:

```bash
cargo new /tmp/kz-consumer && cd /tmp/kz-consumer
cargo add kizzasi-core
cargo tree -i onig      # must report no matching packages
```

If upstream candle ever drops the `onig` default, the fork stops being necessary and these dependencies go back to plain `candle-core`/`candle-nn`.

There is no `cuda` feature. candle's CUDA backend needs an NVIDIA toolkit at build time (its build scripts abort without one) and Cargo cannot make a feature conditional on the host toolchain, so a `cuda` flag would break `--all-features` on every machine without CUDA. Portable GPU acceleration is the `webgpu` feature; on Apple hardware `metal` forwards candle's own Metal backend.

`metal` has the same shape of problem — candle's Metal backend pulls `objc2`, which `compile_error!`s off Apple — but the *target* is something Cargo does know, unlike the presence of a CUDA toolkit. So `metal` is routed through the [`kizzasi-metal`](crates/kizzasi-metal) crate, which declares candle under `cfg(target_vendor = "apple")` and `cfg(not(target_vendor = "apple"))` tables; `resolver = "2"` ignores the features of a platform-specific dependency for targets it is not building. The result is that `--all-features` builds and tests on Linux and Windows, while the backend itself stays Apple-only. Turning `metal` on off-Apple is inert but never silent: `is_metal_available()` returns `false` and `DeviceType::Metal` returns a device error naming the target rather than a CPU device in disguise.

Minimal installation:
```toml
kizzasi = { version = "0.2", default-features = false, features = ["std"] }
```

---

## Quick Start

### Basic Prediction

```rust
use kizzasi::prelude::*;

fn main() -> KizzasiResult<()> {
 // Configure predictor with Mamba2 backend
 let config = KizzasiConfig::new()
 .model_type(ModelType::Mamba2)
 .input_dim(3)
 .output_dim(3)
 .hidden_dim(256)
 .state_dim(16)
 .num_layers(4)
 .context_window(8192);

let mut predictor = Kizzasi::new(config)?;

// Single step prediction (O(1) complexity)
    let input = array![0.1, 0.2, 0.3];
    let output = predictor.step(&input)?;

println!("Predicted: {:?}", output);
    Ok(())
}
```

See [`crates/kizzasi/examples/getting_started.rs`](crates/kizzasi/examples/getting_started.rs) for a step-by-step tutorial covering tokenization, inference, and constraint enforcement.

### With Safety Constraints

```rust
use kizzasi::prelude::*;

fn main() -> KizzasiResult<()> {
 let config = KizzasiConfig::new()
 .model_type(ModelType::Rwkv)
 .input_dim(3)
 .output_dim(3);

let mut predictor = Kizzasi::new(config)?;

// Define safety constraints: each ConstraintBuilder produces exactly one
    // bound on one dimension.
    let velocity_limit = ConstraintBuilder::new()
        .name("velocity_limit")
        .dimension(0)
        .in_range(-1.0, 1.0) // Clamp to [-1, 1]
        .weight(1.0)
        .build()?;

let max_value_limit = ConstraintBuilder::new()
 .name("max_value_limit")
 .dimension(1)
 .less_than(100.0) // Max value < 100
 .weight(1.0)
 .build()?;

let mut guardrails = GuardrailSet::new();
    guardrails.add_dimensional(0, Guardrail::new(velocity_limit, false));
    guardrails.add_dimensional(1, Guardrail::new(max_value_limit, false));

predictor.set_guardrails(guardrails);

// Predictions automatically satisfy constraints
    let input = array![0.5, 0.5, 0.5];
    let safe_output = predictor.step(&input)?;

println!("Safe output: {:?}", safe_output);
    Ok(())
}
```

Rate-of-change limits use a structurally different type, `TemporalConstraint` (see the Constraint System section below) — it is not accepted by `Guardrail::new`, which takes a single-bound `Constraint`.

### Real-Time Audio Processing

```rust
use kizzasi::prelude::*;
use kizzasi::{AudioConfig, AudioInput};

fn main() -> KizzasiResult<()> {
 // Use the audio preset for an optimized configuration (fixed 44.1kHz, mono)
 let mut predictor = KizzasiBuilder::audio_preset().build()?;

// Stream from microphone
    let audio_config = AudioConfig::new()
        .sample_rate(44100)
        .channels(1)
        .buffer_size(1024);

let mut audio = AudioInput::new(audio_config)?;
    audio.start()?;

loop {
        let buffer = audio.read()?;
        for sample in buffer.iter() {
            let _prediction = predictor.step(&array![*sample])?;
            // Use prediction for audio effect, anomaly detection, etc.
        }
    }
}
```

### Multi-Step Prediction

```rust
use kizzasi::prelude::*;

fn main() -> KizzasiResult<()> {
 let config = KizzasiConfig::new()
 .model_type(ModelType::S4)
 .input_dim(6)
 .output_dim(6);

let mut predictor = Kizzasi::new(config)?;

// Predict N steps into the future — returns an Array2<f32> of shape (n_steps, output_dim)
 let initial = array![0.0, 0.0, 0.0, 1.0, 0.0, 0.0];
 let trajectory = predictor.predict_n(&initial, 100)?;

println!("Predicted {} future states", trajectory.nrows());
    Ok(())
}
```

---

## Model Architectures

Kizzasi supports multiple state-of-the-art sequence modeling architectures:

| Model | Per-Step Complexity | State Size | Best For |
|-------|:-------------------:|:----------:|----------|
| **Mamba2** | O(1) | O(d·N) | Default choice, balanced |
| **RWKV** | O(1) | O(d) | Lightweight, fast |
| **S4D** | O(1) | O(d·N) | Smooth dynamics |
| **Transformer** | O(L) | O(L·d) | Baseline comparison |

### Architecture Selection Guide

`kizzasi_core::ModelType` (used by `KizzasiConfig`/`Kizzasi`) has four variants:

```rust
use kizzasi::prelude::*;

fn main() {
    // High-performance, long context (default choice)
    let _default_choice = ModelType::Mamba2; // Selective SSM with SSD

// Lightweight, embedded systems
    let _lightweight = ModelType::Rwkv; // Linear attention, minimal state

// Smooth signal dynamics
    let _smooth_dynamics = ModelType::S4; // HiPPO initialization, structured state space

// Original selective SSM
    let _baseline = ModelType::Mamba; // First-generation selective SSM
}
```

S4D (diagonal-state S4) and Transformer are also implemented, but as standalone architectures in the lower-level `kizzasi-model` crate (`kizzasi_model::s4::S4D`, `kizzasi_model::transformer::Transformer`) used via `kizzasi-inference`'s model registry for research/comparison — they are not selectable through the top-level `Kizzasi` facade's `ModelType`.

---

## Constraint System

### Constraint Types

| Type | Description | Example |
|------|-------------|---------|
| `Range(min, max)` | Value in [min, max] | Joint angles |
| `LessThan(max)` | Upper bound | Velocity limits |
| `GreaterThan(min)` | Lower bound | Minimum pressure |
| `RateLimit(delta)` | Max change per step | Smooth motion |
| `Linear(a, b)` | a·x ≤ b | Conservation laws |
| `Quadratic(Q, c, b)` | x'Qx + c'x ≤ b | Energy bounds |
| `Temporal(LTL)` | Always/Eventually/Until | Safety properties |

### Training Integration

Constraints can be enforced during training as differentiable losses:

```rust
use kizzasi_logic::{
    ConstraintAwareLoss, ConstraintBuilder, LagrangianRelaxation, LogicResult, PenaltyFunction,
};

fn main() -> LogicResult<()> {
 let velocity_limit = ConstraintBuilder::new()
 .name("velocity_limit")
 .dimension(0)
 .in_range(-1.0, 1.0)
 .weight(1.0)
 .build()?;

// Combine task loss with constraint violation penalty
    let loss_fn = ConstraintAwareLoss::new(vec![velocity_limit.clone()], PenaltyFunction::L2, 0.1);
    let prediction = [1.5_f32, 0.2, 0.3];
    let mse_loss = 0.05_f32;
    let total_loss = loss_fn.compute_loss(&prediction, mse_loss);

// Or use Lagrangian relaxation for adaptive weighting
    let mut relaxation = LagrangianRelaxation::new(1).with_multiplier_lr(0.01);
    relaxation.update_multipliers(&prediction, &[velocity_limit]);

println!("total_loss = {total_loss}");
    Ok(())
}
```

---

## Tokenization Strategies

Kizzasi provides multiple signal-to-token conversion strategies:

| Tokenizer | Type | Vocab Size | Best For |
|-----------|:----:|:----------:|----------|
| `ContinuousTokenizer` | Continuous | ∞ | Default, floating-point signals |
| `VQVAETokenizer` | Discrete | Configurable | Learned codebooks |
| `MuLawCodec` | Discrete | 256/65536 | Audio compression |
| `LinearQuantizer` | Discrete | 2^bits | Simple quantization |
| `MultiScaleTokenizer` | Hierarchical | Variable | Multi-resolution |
| `PyramidTokenizer` | Residual | Variable | Progressive refinement |

`kizzasi-tokenizer` is a separate crate dependency (not re-exported by the `kizzasi` facade), and `VQConfig`/`VQVAETokenizer` require the `vqvae` feature (`kizzasi-tokenizer = { version = "0.2", features = ["vqvae"] }`):

```rust
use kizzasi_tokenizer::{Array1, SignalTokenizer, VQConfig, VQVAETokenizer};

fn main() -> Result<(), Box<dyn std::error::Error>> {
 // Create VQ-VAE tokenizer with 1024 codebook entries
 let config = VQConfig {
 codebook_size: 1024,
 embed_dim: 256,
 ema_decay: 0.99,
 ..Default::default()
 };

let input_dim = 64;
    let tokenizer = VQVAETokenizer::new(input_dim, config);

let signal = Array1::from_vec(vec![0.1_f32; input_dim]);
    let tokens = tokenizer.encode(&signal)?;
    let reconstructed = tokenizer.decode(&tokens)?;

println!("Reconstructed {} values", reconstructed.len());
    Ok(())
}
```

---

## Use Cases

### 1. Robotics Control

Real-time motor control with safety bounds:

```rust
use kizzasi::prelude::*;

fn joint_limits() -> LogicResult<Guardrail> {
 let c = ConstraintBuilder::new()
 .name("joint_limits")
 .in_range(-3.14, 3.14)
 .weight(1.0)
 .build()?;
 Ok(Guardrail::new(c, true))
}

fn velocity_limits() -> LogicResult<Guardrail> {
 let c = ConstraintBuilder::new()
 .name("velocity_limits")
 .less_eq(5.0)
 .weight(1.0)
 .build()?;
 Ok(Guardrail::new(c, true))
}

fn torque_limits() -> LogicResult<Guardrail> {
 let c = ConstraintBuilder::new()
 .name("torque_limits")
 .in_range(-50.0, 50.0)
 .weight(1.0)
 .build()?;
 Ok(Guardrail::new(c, false))
}

fn main() -> KizzasiResult<()> {
 // Built directly rather than via KizzasiBuilder::robotics_preset(axes): that preset
 // fixes input_dim == output_dim (and a lighter hidden_dim/state_dim/num_layers tuning),
 // which doesn't fit this use case's asymmetric 12-in/6-out shape.
 let config = KizzasiConfig::new()
 .model_type(ModelType::Mamba2)
 .input_dim(12) // 6 joint positions + 6 velocities
 .output_dim(6); // 6 torque commands

let mut predictor = Kizzasi::new(config)?;

let mut guardrails = GuardrailSet::new();
    guardrails.add_global(joint_limits()?);    // Physical joint ranges
    guardrails.add_global(velocity_limits()?); // Maximum angular velocities
    guardrails.add_global(torque_limits()?);   // Actuator saturation

predictor.set_guardrails(guardrails);

let state = Array1::from_elem(12, 0.0_f32);
    let torques = predictor.step(&state)?;
    println!("Torque commands: {:?}", torques);
    Ok(())
}
```

### 2. Industrial Anomaly Detection

Predictive maintenance for IoT sensors:

```rust
use kizzasi::prelude::*;

fn main() -> KizzasiResult<()> {
 let mut predictor = KizzasiBuilder::sensor_preset(32).build()?; // 32 sensor channels

// Train on "normal" operation data (training loop not shown)
    // At runtime, large prediction errors indicate anomalies
    let sensor_reading = Array1::from_elem(32, 0.0_f32);
    let actual = Array1::from_elem(32, 0.02_f32);

let prediction = predictor.step(&sensor_reading)?;
    let anomaly_score = (prediction - actual).mapv(|x| x.abs()).sum();

println!("Anomaly score: {anomaly_score}");
    Ok(())
}
```

### 3. Audio Synthesis

Next-sample prediction for audio effects:

```rust
use kizzasi::prelude::*;

fn main() -> KizzasiResult<()> {
 let mut predictor = KizzasiBuilder::audio_preset()
 .model_type(ModelType::Rwkv) // Fast, lightweight
 .build()?;

let input_audio = vec![0.1_f32, 0.2, -0.1, 0.05, 0.0];
    let mut output_audio = Vec::with_capacity(input_audio.len());

// WaveNet-style sample-by-sample generation
    for sample in input_audio.iter() {
        let next_sample = predictor.step(&array![*sample])?;
        output_audio.push(next_sample[0]);
    }

println!("Generated {} samples", output_audio.len());
    Ok(())
}
```

### 4. Video Frame Prediction

Anime in-betweening and frame interpolation:

```rust
use kizzasi::prelude::*;

fn bone_length_constraints() -> LogicResult<Guardrail> {
 let c = ConstraintBuilder::new()
 .name("bone_length")
 .in_range(0.0, 2.0)
 .weight(1.0)
 .build()?;
 Ok(Guardrail::new(c, false))
}

fn joint_angle_limits() -> LogicResult<Guardrail> {
 let c = ConstraintBuilder::new()
 .name("joint_angle")
 .in_range(-3.14, 3.14)
 .weight(1.0)
 .build()?;
 Ok(Guardrail::new(c, false))
}

fn main() -> KizzasiResult<()> {
 let config = KizzasiConfig::new()
 .model_type(ModelType::Mamba2)
 .input_dim(1024) // Frame embedding dimension
 .output_dim(1024);

let mut predictor = Kizzasi::new(config)?;

// Enforce skeleton/pose constraints on the predicted frame embedding
    let mut guardrails = GuardrailSet::new();
    guardrails.add_global(bone_length_constraints()?);
    guardrails.add_global(joint_angle_limits()?);
    predictor.set_guardrails(guardrails);

let frame = Array1::from_elem(1024, 0.0_f32);
    let next_frame = predictor.step(&frame)?;
    println!("Predicted frame with {} features", next_frame.len());
    Ok(())
}
```

---

## Performance

### Inference Characteristics

| Metric | Mamba2 | RWKV | S4D | Transformer |
|--------|:------:|:----:|:---:|:-----------:|
| Per-step complexity | O(1) | O(1) | O(1) | O(L) |
| Memory (state) | O(d·N) | O(d) | O(d·N) | O(L·d) |
| Context length | Unlimited | Unlimited | Unlimited | Fixed L |
| Training parallel | ✓ | ✓ | ✓ | ✓ |

Per-step complexity and memory scaling are analytic properties of each architecture class. Wall-clock latency is hardware- and configuration-dependent and has not been benchmarked on release hardware for this version; `cargo bench` runs the real Criterion suite (see `crates/kizzasi-model/benches/architecture_comparison.rs` for a single-step latency sweep across architectures and hidden dimensions) if you want numbers for your own machine.

### Optimization Features

- **SIMD Vectorization**: Optimized dot products, layer norms, softmax
- **Parallel Scan**: O(log N) depth parallel SSM scan
- **Memory Pooling**: Reusable array allocations
- **Batch Processing**: Efficient multi-sequence inference
- **Continuous Batching**: Dynamic batch formation for streaming

---

## COOLJAPAN Ecosystem

Kizzasi is part of the COOLJAPAN scientific computing ecosystem:

| Crate | Purpose |
|-------|---------|
| [scirs2-core](https://crates.io/crates/scirs2-core) | Array operations, random, SIMD |
| [scirs2-signal](https://crates.io/crates/scirs2-signal) | Signal processing algorithms |
| [scirs2-fft](https://crates.io/crates/scirs2-fft) | Fast Fourier Transform |
| [scirs2-linalg](https://crates.io/crates/scirs2-linalg) | Linear algebra |
| [scirs2-series](https://crates.io/crates/scirs2-series) | Time-series utilities |
| [tensorlogic-ir](https://crates.io/crates/tensorlogic-ir) | Neuro-symbolic constraints |
| [candle-core](https://crates.io/crates/candle-core) | ML backend (GPU acceleration) |
| [oxifft](https://crates.io/crates/oxifft) | Fast Fourier Transform |
| [oxicode](https://crates.io/crates/oxicode) | Binary serialization |
| [oxirs-core](https://crates.io/crates/oxirs-core) / [oxirs-gql](https://crates.io/crates/oxirs-gql) | RDF/GraphQL data layer |
| [wgpu](https://crates.io/crates/wgpu) | GPU compute backend |

See [KIZZASI_POLICY.md](KIZZASI_POLICY.md) for dependency guidelines.

---

## Project Statistics

```
===============================================================================
 Language            Files        Lines         Code     Comments       Blanks
===============================================================================
 Dockerfile              1           53           26           14           13
 JavaScript              1          142          104           18           20
 Makefile                1          191          135           28           28
 Python                  8          984          687           79          218
 Shell                   4          384          276           51           57
 TOML                   16         1619          810          676          133
 YAML                    1           41           38            0            3
-------------------------------------------------------------------------------
 HTML                    2           96           88            0            8
 |- CSS                  2          103          103            0            0
 |- JavaScript           2          266          209           22           35
 (Total)                            465          400           22           43
-------------------------------------------------------------------------------
 Jupyter Notebooks       3            0            0            0            0
 |- Markdown             3          169            1          127           41
 |- Python               3          688          538           54           96
 (Total)                            857          539          181          137
-------------------------------------------------------------------------------
 Markdown               41        12362            0         9537         2825
 |- BASH                16          219          131           57           31
 |- Dockerfile           1           19           19            0            0
 |- Python               3          277          189           31           57
 |- Rust                28         3007         2142          382          483
 |- TOML                19          129          100           20            9
 |- YAML                 1           27           25            0            2
 (Total)                          16040         2606        10027         3407
-------------------------------------------------------------------------------
 Rust                  438       215697       170202        13758        31737
 |- Markdown           436        32033          917        26463         4653
 (Total)                         247730       171119        40221        36390
===============================================================================
 Total                 516       231569       172366        24161        35042
===============================================================================

Tests: 3,688 passing, 24 skipped (workspace, all-features) | Clippy: 0 warnings | Rustdoc: 0 warnings (strict)
```

---

## Contributing

Contributions are welcome! Please open an issue or pull request on [GitHub](https://github.com/cool-japan/kizzasi).

### Development Setup

```bash
git clone https://github.com/cool-japan/kizzasi
cd kizzasi
cargo build --all-features
cargo test --all-features
```

### Code Quality

```bash
# Format
cargo fmt

# Lint
cargo clippy --all-features

# Benchmarks
cargo bench

# Documentation
cargo doc --all-features --no-deps
```

---

## Sponsorship

Kizzasi is developed and maintained by **COOLJAPAN OU (Team Kitasan)**.

If you find Kizzasi useful, please consider sponsoring the project to support continued development of the Pure Rust ecosystem.

[![Sponsor](https://img.shields.io/badge/Sponsor-%E2%9D%A4-red?logo=github)](https://github.com/sponsors/cool-japan)

**[https://github.com/sponsors/cool-japan](https://github.com/sponsors/cool-japan)**

Your sponsorship helps us:
- Maintain and improve the COOLJAPAN ecosystem
- Keep the entire ecosystem (OxiBLAS, OxiFFT, SciRS2, etc.) 100% Pure Rust
- Provide long-term support and security updates

## License

Licensed under the Apache License, Version 2.0 ([LICENSE](LICENSE) or http://www.apache.org/licenses/LICENSE-2.0).

---

## Acknowledgments

- The COOLJAPAN ecosystem contributors
- Mamba/S4 research teams at CMU and Princeton
- RWKV community
- The Rust ML ecosystem (candle, burn)

---

*Kizzasi: Sensing the future, one prediction at a time.*

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