Irodori-TTS-500M-v3 — GGUF (ggml-quantised)

GGUF / ggml conversion of Aratako/Irodori-TTS-500M-v3 for use with CrispStrobe/CrispASR.

Irodori-TTS is a 500M-param Rectified Flow Diffusion Transformer (RF-DiT) text-to-speech model with zero-shot voice cloning via DAC-VAE latent conditioning. Japanese-focused with a 102K-vocab sarashina2.2 tokenizer. 48 kHz mono output.

License: MIT (follows upstream Irodori-TTS license).

Files

Architecture

Text Input (Japanese / mixed)
  │
sarashina2.2 Tokenize (102K vocab, BPE)
  │
TextEncoder (14L, 1280d, 10 heads, RoPE + SwiGLU)
  │── Each position: self-attention + gated residual + SwiGLU FFN
  │
  ├── [Optional] ReferenceLatentEncoder (14L, 1280d)
  │    └── DAC-VAE latent from reference audio → speaker conditioning
  │
DiT Backbone (24L, 2048d, 16 heads)
  │── LowRankAdaLN (rank=256) timestep conditioning
  │── JointAttention: self-KV + text-context-KV + speaker-context-KV
  │── Half-RoPE (first half of head_dim rotated, rest passthrough)
  │── SwiGLU MLP (ratio 2.875)
  │
Euler RF ODE Solver (40 steps, CFG)
  │── noise → DAC-VAE latent sequence (32-dim continuous)
  │
Semantic-DACVAE Decoder (48 kHz reconstruction)
  │── 32-dim latent → Snake1d + ConvTranspose1d upsampling → PCM
  │
Output: float32 mono @ 48 kHz

Source model

• Upstream: Aratako/Irodori-TTS-500M-v3 (safetensors, ~1.9 GB)
• Codec: Aratako/Semantic-DACVAE-Japanese-32dim
• Tokenizer: sbintuitions/sarashina2.2-0.5b
• Code: Aratako/Irodori-TTS
• Converted with: models/convert-irodori-tts-to-gguf.py

Provenance and EU AI Act Art. 53 note

• Upstream model: Aratako/Irodori-TTS-500M-v3 — published by Aratako.
• Upstream licence: mit. This repository redistributes under the same terms; it grants no rights the upstream licence does not.
• What was done here: format conversion and/or quantisation only (GGUF/GGML). No training, no fine-tuning, no merging, no distillation, no change to architecture, vocabulary or capability. Only the numeric representation of the upstream weights differs.
• Training data: documented — where it is documented at all — by the upstream provider; see the upstream model card. No training data was used, added or selected by this repository.
• Provider status: under Regulation (EU) 2024/1689 the upstream authors remain the provider of this model. Converting the serialisation format does not make this repository the provider of a new general-purpose AI model, and no such claim is made. Questions about training content, copyright policy or model capability belong upstream.