This narrated lesson adapts Corequisite Skills for Introductory Statistics, a custom course edition compiled by XYZ Homework from OpenStax Contemporary Mathematics, Elementary Algebra 2e, Intermediate Algebra 2e, and Prealgebra 2e. OpenStax, Rice University; complete originals: https://openstax.org/ . The course outline is adapted from Larry Green, Support Course for Elementary Statistics, LibreTexts, https://stats.libretexts.org/Bookshelves/Introductory_Statistics/Support_Course_for_Elementary_Statistics , under Creative Commons Attribution 4.0, https://creativecommons.org/licenses/by/4.0/ . Lessons 2.4 and 6.7 are authored by XYZ Homework. This free lesson adaptation is distributed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0, https://creativecommons.org/licenses/by-nc-sa/4.0/ . XYZ Homework added the narrated explanation, diagrams, captions, transcript, and thinking pause; the course edition records its source corrections. Narration generated locally using Kokoro-82M v1.0, voice af_heart. Model and inference code: Apache-2.0. Retain and link the official model card, its training acknowledgements, and Apache-2.0 licence. Primary sources: https://huggingface.co/hexgrad/Kokoro-82M https://huggingface.co/hexgrad/Kokoro-82M/blob/f3ff3571791e39611d31c381e3a41a3af07b4987/VOICES.md https://github.com/hexgrad/kokoro/blob/main/LICENSE Official model card and training acknowledgements: --- license: apache-2.0 language: - en base_model: - yl4579/StyleTTS2-LJSpeech pipeline_tag: text-to-speech --- **Kokoro** is an open-weight TTS model with 82 million parameters. Despite its lightweight architecture, it delivers comparable quality to larger models while being significantly faster and more cost-efficient. With Apache-licensed weights, Kokoro can be deployed anywhere from production environments to personal projects. 🐈 **GitHub**: https://github.com/hexgrad/kokoro 🚀 **Demo**: https://hf.co/spaces/hexgrad/Kokoro-TTS > [!NOTE] > As of April 2025, the market rate of Kokoro served over API is **under $1 per million characters of text input**, or under $0.06 per hour of audio output. (On average, 1000 characters of input is about 1 minute of output.) Sources: [ArtificialAnalysis/Replicate at 65 cents per M chars](https://artificialanalysis.ai/text-to-speech/model-family/kokoro#price) and [DeepInfra at 80 cents per M chars](https://deepinfra.com/hexgrad/Kokoro-82M). > > This is an Apache-licensed model, and Kokoro has been deployed in numerous projects and commercial APIs. We welcome the deployment of the model in real use cases. > [!CAUTION] > Fake websites like kokorottsai_com (snapshot: https://archive.ph/nRRnk) and kokorotts_net (snapshot: https://archive.ph/60opa) are likely scams masquerading under the banner of a popular model. > > Any website containing "kokoro" in its root domain (e.g. kokorottsai_com, kokorotts_net) is **NOT owned by and NOT affiliated with this model page or its author**, and attempts to imply otherwise are red flags. - [Releases](#releases) - [Usage](#usage) - [EVAL.md](https://huggingface.co/hexgrad/Kokoro-82M/blob/main/EVAL.md) ↗️ - [SAMPLES.md](https://huggingface.co/hexgrad/Kokoro-82M/blob/main/SAMPLES.md) ↗️ - [VOICES.md](https://huggingface.co/hexgrad/Kokoro-82M/blob/main/VOICES.md) ↗️ - [Model Facts](#model-facts) - [Training Details](#training-details) - [Creative Commons Attribution](#creative-commons-attribution) - [Acknowledgements](#acknowledgements) ### Releases | Model | Published | Training Data | Langs & Voices | SHA256 | | ----- | --------- | ------------- | -------------- | ------ | | **v1.0** | **2025 Jan 27** | **Few hundred hrs** | [**8 & 54**](https://huggingface.co/hexgrad/Kokoro-82M/blob/main/VOICES.md) | `496dba11` | | [v0.19](https://huggingface.co/hexgrad/kLegacy/tree/main/v0.19) | 2024 Dec 25 | <100 hrs | 1 & 10 | `3b0c392f` | | Training Costs | v0.19 | v1.0 | **Total** | | -------------- | ----- | ---- | ----- | | in A100 80GB GPU hours | 500 | 500 | **1000** | | average hourly rate | $0.80/h | $1.20/h | **$1/h** | | in USD | $400 | $600 | **$1000** | ### Usage You can run this basic cell on [Google Colab](https://colab.research.google.com/). [Listen to samples](https://huggingface.co/hexgrad/Kokoro-82M/blob/main/SAMPLES.md). For more languages and details, see [Advanced Usage](https://github.com/hexgrad/kokoro?tab=readme-ov-file#advanced-usage). ```py !pip install -q kokoro>=0.9.2 soundfile !apt-get -qq -y install espeak-ng > /dev/null 2>&1 from kokoro import KPipeline from IPython.display import display, Audio import soundfile as sf import torch pipeline = KPipeline(lang_code='a') text = ''' [Kokoro](/kˈOkəɹO/) is an open-weight TTS model with 82 million parameters. Despite its lightweight architecture, it delivers comparable quality to larger models while being significantly faster and more cost-efficient. With Apache-licensed weights, [Kokoro](/kˈOkəɹO/) can be deployed anywhere from production environments to personal projects. ''' generator = pipeline(text, voice='af_heart') for i, (gs, ps, audio) in enumerate(generator): print(i, gs, ps) display(Audio(data=audio, rate=24000, autoplay=i==0)) sf.write(f'{i}.wav', audio, 24000) ``` Under the hood, `kokoro` uses [`misaki`](https://pypi.org/project/misaki/), a G2P library at https://github.com/hexgrad/misaki ### Model Facts **Architecture:** - StyleTTS 2: https://arxiv.org/abs/2306.07691 - ISTFTNet: https://arxiv.org/abs/2203.02395 - Decoder only: no diffusion, no encoder release **Architected by:** Li et al @ https://github.com/yl4579/StyleTTS2 **Trained by**: `@rzvzn` on Discord **Languages:** Multiple **Model SHA256 Hash:** `496dba118d1a58f5f3db2efc88dbdc216e0483fc89fe6e47ee1f2c53f18ad1e4` ### Training Details **Data:** Kokoro was trained exclusively on **permissive/non-copyrighted audio data** and IPA phoneme labels. Examples of permissive/non-copyrighted audio include: - Public domain audio - Audio licensed under Apache, MIT, etc - Synthetic audio[1] generated by closed[2] TTS models from large providers
[1] https://copyright.gov/ai/ai_policy_guidance.pdf
[2] No synthetic audio from open TTS models or "custom voice clones" **Total Dataset Size:** A few hundred hours of audio **Total Training Cost:** About $1000 for 1000 hours of A100 80GB vRAM ### Creative Commons Attribution The following CC BY audio was part of the dataset used to train Kokoro v1.0. | Audio Data | Duration Used | License | Added to Training Set After | | ---------- | ------------- | ------- | --------------------------- | | [Koniwa](https://github.com/koniwa/koniwa) `tnc` | <1h | [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/deed.ja) | v0.19 / 22 Nov 2024 | | [SIWIS](https://datashare.ed.ac.uk/handle/10283/2353) | <11h | [CC BY 4.0](https://datashare.ed.ac.uk/bitstream/handle/10283/2353/license_text) | v0.19 / 22 Nov 2024 | ### Acknowledgements - 🛠️ [@yl4579](https://huggingface.co/yl4579) for architecting StyleTTS 2. - 🏆 [@Pendrokar](https://huggingface.co/Pendrokar) for adding Kokoro as a contender in the TTS Spaces Arena. - 📊 Thank you to everyone who contributed synthetic training data. - ❤️ Special thanks to all compute sponsors. - 👾 Discord server: https://discord.gg/QuGxSWBfQy - 🪽 Kokoro is a Japanese word that translates to "heart" or "spirit". It is also the name of an [AI in the Terminator franchise](https://terminator.fandom.com/wiki/Kokoro). kokoro Official voice information: # Voices - 🇺🇸 [American English](#american-english): 11F 9M - 🇬🇧 [British English](#british-english): 4F 4M - 🇯🇵 [Japanese](#japanese): 4F 1M - 🇨🇳 [Mandarin Chinese](#mandarin-chinese): 4F 4M - 🇪🇸 [Spanish](#spanish): 1F 2M - 🇫🇷 [French](#french): 1F - 🇮🇳 [Hindi](#hindi): 2F 2M - 🇮🇹 [Italian](#italian): 1F 1M - 🇧🇷 [Brazilian Portuguese](#brazilian-portuguese): 1F 2M For each voice, the given grades are intended to be estimates of the **quality and quantity** of its associated training data, both of which impact overall inference quality. Subjectively, voices will sound better or worse to different people. Support for non-English languages may be absent or thin due to weak G2P and/or lack of training data. Some languages are only represented by a small handful or even just one voice (French). Most voices perform best on a "goldilocks range" of 100-200 tokens out of ~500 possible. Voices may perform worse at the extremes: - **Weakness** on short utterances, especially less than 10-20 tokens. Root cause could be lack of short-utterance training data and/or model architecture. One possible inference mitigation is to bundle shorter utterances together. - **Rushing** on long utterances, especially over 400 tokens. You can chunk down to shorter utterances or adjust the `speed` parameter to mitigate this. **Target Quality** - How high quality is the reference voice? This grade may be impacted by audio quality, artifacts, compression, & sample rate. - How well do the text labels match the audio? Text/audio misalignment (e.g. from hallucinations) will lower this grade. **Training Duration** - How much audio was seen during training? Smaller durations result in a lower overall grade. - 10 hours <= **HH hours** < 100 hours - 1 hour <= H hours < 10 hours - 10 minutes <= MM minutes < 100 minutes - 1 minute <= _M minutes_ 🤏 < 10 minutes ### American English - `lang_code='a'` in [`misaki[en]`](https://github.com/hexgrad/misaki) - espeak-ng `en-us` fallback | Name | Traits | Target Quality | Training Duration | Overall Grade | SHA256 | | ---- | ------ | -------------- | ----------------- | ------------- | ------ | | **af\_heart** | 🚺❤️ | | | **A** | `0ab5709b` | | af_alloy | 🚺 | B | MM minutes | C | `6d877149` | | af_aoede | 🚺 | B | H hours | C+ | `c03bd1a4` | | af_bella | 🚺🔥 | **A** | **HH hours** | **A-** | `8cb64e02` | | af_jessica | 🚺 | C | MM minutes | D | `cdfdccb8` | | af_kore | 🚺 | B | H hours | C+ | `8bfbc512` | | af_nicole | 🚺🎧 | B | **HH hours** | B- | `c5561808` | | af_nova | 🚺 | B | MM minutes | C | `e0233676` | | af_river | 🚺 | C | MM minutes | D | `e149459b` | | af_sarah | 🚺 | B | H hours | C+ | `49bd364e` | | af_sky | 🚺 | B | _M minutes_ 🤏 | C- | `c799548a` | | am_adam | 🚹 | D | H hours | F+ | `ced7e284` | | am_echo | 🚹 | C | MM minutes | D | `8bcfdc85` | | am_eric | 🚹 | C | MM minutes | D | `ada66f0e` | | am_fenrir | 🚹 | B | H hours | C+ | `98e507ec` | | am_liam | 🚹 | C | MM minutes | D | `c8255075` | | am_michael | 🚹 | B | H hours | C+ | `9a443b79` | | am_onyx | 🚹 | C | MM minutes | D | `e8452be1` | | am_puck | 🚹 | B | H hours | C+ | `dd1d8973` | | am_santa | 🚹 | C | _M minutes_ 🤏 | D- | `7f2f7582` | ### British English - `lang_code='b'` in [`misaki[en]`](https://github.com/hexgrad/misaki) - espeak-ng `en-gb` fallback | Name | Traits | Target Quality | Training Duration | Overall Grade | SHA256 | | ---- | ------ | -------------- | ----------------- | ------------- | ------ | | bf_alice | 🚺 | C | MM minutes | D | `d292651b` | | bf_emma | 🚺 | B | **HH hours** | B- | `d0a423de` | | bf_isabella | 🚺 | B | MM minutes | C | `cdd4c370` | | bf_lily | 🚺 | C | MM minutes | D | `6e09c2e4` | | bm_daniel | 🚹 | C | MM minutes | D | `fc3fce4e` | | bm_fable | 🚹 | B | MM minutes | C | `d44935f3` | | bm_george | 🚹 | B | MM minutes | C | `f1bc8122` | | bm_lewis | 🚹 | C | H hours | D+ | `b5204750` | ### Japanese - `lang_code='j'` in [`misaki[ja]`](https://github.com/hexgrad/misaki) - Total Japanese training data: H hours | Name | Traits | Target Quality | Training Duration | Overall Grade | SHA256 | CC BY | | ---- | ------ | -------------- | ----------------- | ------------- | ------ | ----- | | jf_alpha | 🚺 | B | H hours | C+ | `1bf4c9dc` | | | jf_gongitsune | 🚺 | B | MM minutes | C | `1b171917` | [gongitsune](https://github.com/koniwa/koniwa/blob/master/source/tnc/tnc__gongitsune.txt) | | jf_nezumi | 🚺 | B | _M minutes_ 🤏 | C- | `d83f007a` | [nezuminoyomeiri](https://github.com/koniwa/koniwa/blob/master/source/tnc/tnc__nezuminoyomeiri.txt) | | jf_tebukuro | 🚺 | B | MM minutes | C | `0d691790` | [tebukurowokaini](https://github.com/koniwa/koniwa/blob/master/source/tnc/tnc__tebukurowokaini.txt) | | jm_kumo | 🚹 | B | _M minutes_ 🤏 | C- | `98340afd` | [kumonoito](https://github.com/koniwa/koniwa/blob/master/source/tnc/tnc__kumonoito.txt) | ### Mandarin Chinese - `lang_code='z'` in [`misaki[zh]`](https://github.com/hexgrad/misaki) - Total Mandarin Chinese training data: H hours | Name | Traits | Target Quality | Training Duration | Overall Grade | SHA256 | | ---- | ------ | -------------- | ----------------- | ------------- | ------ | | zf_xiaobei | 🚺 | C | MM minutes | D | `9b76be63` | | zf_xiaoni | 🚺 | C | MM minutes | D | `95b49f16` | | zf_xiaoxiao | 🚺 | C | MM minutes | D | `cfaf6f2d` | | zf_xiaoyi | 🚺 | C | MM minutes | D | `b5235dba` | | zm_yunjian | 🚹 | C | MM minutes | D | `76cbf8ba` | | zm_yunxi | 🚹 | C | MM minutes | D | `dbe6e1ce` | | zm_yunxia | 🚹 | C | MM minutes | D | `bb2b03b0` | | zm_yunyang | 🚹 | C | MM minutes | D | `5238ac22` | ### Spanish - `lang_code='e'` in [`misaki[en]`](https://github.com/hexgrad/misaki) - espeak-ng `es` | Name | Traits | SHA256 | | ---- | ------ | ------ | | ef_dora | 🚺 | `d9d69b0f` | | em_alex | 🚹 | `5eac53f7` | | em_santa | 🚹 | `aa8620cb` | ### French - `lang_code='f'` in [`misaki[en]`](https://github.com/hexgrad/misaki) - espeak-ng `fr-fr` - Total French training data: <11 hours | Name | Traits | Target Quality | Training Duration | Overall Grade | SHA256 | CC BY | | ---- | ------ | -------------- | ----------------- | ------------- | ------ | ----- | | ff_siwis | 🚺 | B | <11 hours | B- | `8073bf2d` | [SIWIS](https://datashare.ed.ac.uk/handle/10283/2353) | ### Hindi - `lang_code='h'` in [`misaki[en]`](https://github.com/hexgrad/misaki) - espeak-ng `hi` - Total Hindi training data: H hours | Name | Traits | Target Quality | Training Duration | Overall Grade | SHA256 | | ---- | ------ | -------------- | ----------------- | ------------- | ------ | | hf_alpha | 🚺 | B | MM minutes | C | `06906fe0` | | hf_beta | 🚺 | B | MM minutes | C | `63c0a1a6` | | hm_omega | 🚹 | B | MM minutes | C | `b55f02a8` | | hm_psi | 🚹 | B | MM minutes | C | `2f0f055c` | ### Italian - `lang_code='i'` in [`misaki[en]`](https://github.com/hexgrad/misaki) - espeak-ng `it` - Total Italian training data: H hours | Name | Traits | Target Quality | Training Duration | Overall Grade | SHA256 | | ---- | ------ | -------------- | ----------------- | ------------- | ------ | | if_sara | 🚺 | B | MM minutes | C | `6c0b253b` | | im_nicola | 🚹 | B | MM minutes | C | `234ed066` | ### Brazilian Portuguese - `lang_code='p'` in [`misaki[en]`](https://github.com/hexgrad/misaki) - espeak-ng `pt-br` | Name | Traits | SHA256 | | ---- | ------ | ------ | | pf_dora | 🚺 | `07e4ff98` | | pm_alex | 🚹 | `cf0ba8c5` | | pm_santa | 🚹 | `d4210316` | kokoro licence / source notices: Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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