Sep 23, 2022 · daleh October 29, 2022, 8:00pm 16. bin" model weights. この実装は、openai / whisperよりも最大4倍高速で、同じ精度で、より少ないメモリを使用します。. Feb 2, 2024 · Whisper: The original Whisper model is implemented in Python and supports running on both the CPU and the GPU. However, as the GPUs inference speed is so much faster than real-time anyways (around 0. Dockerfile has some issues. pip install -U openai-whisper. Implicitly enables hidden GPU flag at runtime. May 4, 2023 · If no value for option '--gpu-code' is specified, then the value of this option defaults to the value of '--gpu-architecture'. tamo added a commit to tamo/whisper. dk/ 👉 Subtitle Edit on GitHub whisper. It does indeed: that runs slower than CPU alone. 2) with a 2 sec mp3 audio and it took 12 sec to transcribe with --language en --model tiny parameters. faster-whisper is a reimplementation of OpenAI's Whisper model using CTranslate2, which is a fast inference engine for Transformer models. Nov 22, 2022 · model = whisper. We’re on a journey to advance and democratize artificial intelligence through open source and open science. Apr 2, 2023 · whisper. I want to test it with CUDA GPU for speed. en small ~2 GB ~6x. This is more of a real world test with actual work loads to be handled. It provides high-performance inference of OpenAI's Whisper automatic speech recognition (ASR) model running on your local machine. Apr 22, 2023 · Step 1 : 建議使用Anaconda安裝，請於下圖下載Ananconda. Jan 8, 2024 · Hi, I am a nixOS beginner for about a month. The ggml library is one of the first library for local LLM interference. (Set TF_CPP_MIN_LOG_LEVEL=0 and rerun for more info. 940] And so my fellow Americans ask not what your country can do for you. 👍 1. Install whisper Mar 30, 2023 · faster-whisper とは. 3. cpp that referenced this issue on Nov 19, 2023. When compiling stuff with CUDA support you need to distinguish between the compile phase and the runtime phase: When you build the image with docker build without mapping a graphics card into the container the build should link against the CUDA library stubs (e. The models were trained on either English-only data or multilingual data. whisper-cpp-log: allows hooking into whisper. openblas: enable OpenBLAS support. The JAX code is compatible on CPU, GPU and TPU, and can be run standalone (see Pipeline Usage ) or as an inference endpoint (see Creating an Endpoint ). 1. cuda. sh: Livestream audio Mar 9, 2023 · Hey, thanks for sharing this here! I'm the author of faster-whisper and CTranslate2. To achieve good performance, you need an Nvidia CUDA GPU with > 8 GB VRAM. cpp's log output and sending it to the log backend. 7. 0 and Whisper A Step-by-Step Guide to Whisper. Contribute to ggerganov/whisper. This repository comes with "ggml-tiny. cpp repo to download one of the models. Oct 1, 2022 · Port of OpenAI's Whisper model in C/C++. Whisper and whisperX also splits it up internally, but has mechanism to fix the boundaries and so are much better. cpp en tu propio ordenador para pasar de audio a texto. libcuda. Oct 12, 2023 · I am trying to run whisper. Install PaddleSpeech. cpp 的模型转换工具及一些其他必要组件等。 Whisper模型下载及使用Whisper的安装方法： 命令行安装，可以使用 pip 直接安装、更新：（如果友友看不明白pip命令那么直接跳到Whi Mar 4, 2023 · Author. tamo mentioned this issue on Nov 19, 2023. Each version of Whisper. 10. 这篇文章应该是网上目前关于Windows系统部署whisper最全面的中文攻略。. Thanks, this helped me too. Next, you need to fetch a Whisper model converted into . I a, able to run my raspberry pi 4 whisper. Apr 16, 2023 · is there a way to run whisper. pythonの Jul 13, 2023 · doesn't work with arch=any OR arch=-arch=compute_61 for my GTX 1080 in Makefile make clean WHISPER_CUBLAS=1 make stream -j I whisper. cpp run the live stream using following code: (GPU, step set to 700 works fine) I get "hallucinations" when not talking :robot: The free, Open Source OpenAI alternative. BLAS CPU support via OpenBLAS Collaborate on models, datasets and Spaces. The English-only models were trained on the task of speech Now build whisper. Also, when running whisper, my GPU hovers around 40-50% utilization, while running whisperX pushes it up to >95% utilization. So you can let it do this, and it should work, if not, then prompt it in that language. wav) Click on the "Transcribe" button to start the transcription. Load Time. @acoloss Try the prompting techniques from myself and @RonaldGRuckus, this should fix the “Welsh” problem. Also, I've tried the solution from @diaojunxian and it works! Inference is much faster when it's run on GPU. Upstream whisper. wav" --model medium --device cuda. cpp folder, and run the following command: mkdir -p output; Apr 1, 2023 · In this video, I'll show you How to Use Whisper via GPU in Subtitle Edit. In this paper, we build on top of Whisper and create Whisper-Streaming, an implementation of real-time speech transcription and translation of Whisper-like models. generate , including num_beams for beam-search, return_timestamps for segment-level timestamps, and prompt_ids for Nov 2, 2022 · Hello there, In principle you should be able to apply TensorRT to the model and get a similar increase in performance for GPU deployment. For example, I applied dynamic quantization to the OpenAI Whisper model (speech recognition) across a range of model sizes (ranging from tiny which had 39M params to large which had 1. 6. sh: Helper script to easily generate a karaoke video of raw audio capture: livestream. 5. The version of Whisper. Just re-tried with v1. Buzz is better on the App Store. I tried the CuBLAS instructions, but I could not get it to work (maybe my bad or GPU incompatibility) I would appreciate it if you guys could give me a tip or some advice. This is the smallest and fastest version of whisper model, but it has worse quality comparing to other models. metal: enable Metal support. This update adds a bunch of improvements to the visualization, playback, editing, and exporting of your transcripts. Category. 3× slower). Whisper is a Transformer based encoder-decoder model, also referred to as a sequence-to-sequence model. net is tied to a specific version of Whisper. It has no dependencies, low memory usage, excellent performance, supports multiple technologies and platforms, supports mixed precision and integer quantization and other advantages. cpp package with the original sequential long-form transcription algorithm. cpp, and there is roughly a 1. load_model("small", device="cuda") 发现仍然无法运行，提示我 RuntimeError: Attempting to deserialize object on a CUDA device but torch. It was trained on 680k hours of labelled speech data annotated using large-scale weak supervision. in the terminal, and create a new folder called data. We would like to show you a description here but the site won’t allow us. Clone the Repository. Apr 24, 2024 · Developers can now integrate ChatGPT and Whisper models into their apps and products through our API. faster-whisperは、トランスフォーマーモデルの高速推論エンジンであるCTranslate2を使用したOpenAIのWhisperモデルの再実装です。. Transcribe an audio file, alternatively specifying language, model, and device. I was not able to use CUDA due to compatibility issues with pytorch 2. You need to use the 16 kHz sampling rate wav file. 3 xtmu, gparvind, and LaptopDev reacted with thumbs up emoji. ggerganov#1517 Redistribute CUDA DLLs. The existing CPU-only implementation achieves this goal - it is bloat-free and very simple. Want to try it yourself? Use my code to run your own tests. It runs slightly slower than Whisper on GPU for the small, medium and large models (1. [00:00. Read README. モデルの用意. だいたい GPU の 10 倍くらい時間 Upstream whisper. this will modify the gcc command so that it includes ggml-cuda. cpp/models にあるREADMEにhuggingfaceのモデルを使用する場合の流れが書いてあるので，それに従います．. Thanks! Jan 8, 2023 · 結論から言うと，whisper. Requirements: Full admin rights on your computer. Apr 7, 2024 · セットアップ. M1 Max 24c GPU. ← WavLM XLS-R →. Acquire the Whisper Model. net is the same as the version of Whisper it is based on. 120+xpu and both model loading time and decoding have a "good" speed now. jacob-salassi mentioned this issue on May 14, 2023. It is suitable for scenarios that require real Compared to OpenAI's PyTorch code, Whisper JAX runs over 70x faster, making it the fastest Whisper implementation available. cpp on gpu? Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. ggml format. Drop-in replacement for OpenAI running on consumer-grade hardware. . まずは本家 openai-whisper 使います. nvim: Speech-to-text plugin for Neovim: generate-karaoke. en. cpp. A PC with a CUDA-capable dedicated GPU with at least 4GB of VRAM (but more VRAM is May 29, 2023 · AI字幕神器whisper最全中文攻略. Sep 22, 2022 · After doing this I was able to run the following command ( choose whatever model fits your needs best ): whisper "audio. large 1550 M N/A large ~10 GB 1x. cpp Distil-Whisper can be run with the Whisper. cpp support CUDA / GPU? One of the main goals of this implementation is to be very minimalistic and be able to run it on a large spectrum of hardware. Copy paste your audio file (s) that you want to convert into the data folder. Flash + language support (ref ggerganov#2) …. The efficiency can be further improved with 8-bit quantization on both CPU and GPU. It is implemented in C/C++ and runs only on the CPU. Nov 10, 2022 · Cuda is apparently unsupported on M1 macs, and if I try --device mps I get a warning that The operator 'aten::repeat_interleave. I was running the desktop version of Whisper using the CMD prompt interface successfully for a few days using the 4GB NVIDIA graphics card that came with my Dell, so I sprang for an AMD Radeon RX 6700 XT and had it installed yesterday, only to discover that Whisper didn't recognize it and was reverting my my CPU. cpp: Whisper. cpp with CLBlast support: ```Makefile:cd whisper. cpp that referenced this issue on Apr 27, 2023. I was a bit surprised by the benchmark results on this CPU. cpp 项目是将 Whisper 移植到 C/C++ 中，而今天介绍的 Const-me/Whisper 项目则是 whisper. cpp 项目，以及该项目的 GUI 版本 ：whisperDesktop 。 May 5, 2023 · windows本地搭建openai whisper并开启NVIDIA GPU加速 需要的工具. Recently, Georgi Gerganov released a C++ port optimized for CPU and especially Apple Silicon Platform. cpp and tried it on my 6 year old desktop, CPU: AMD Ryzen 5 1600 Six-Core Processor, GPU: Radeon RX 460/560D, Video memory: 2048MB, gfx803, running Arch Linux based Manjaro. まずは openai-whisper. cpp using make. 1, an update to our Electron desktop Whisper implementation that introduces a lot of new features to speed up your transcription workflow. ) I am pretty sure that the box I am connecting to via ssh has 20 CPU cores and 2 GPU cores however the GPUs are not recognized by Jax. cpp 项目的模型文件下载及简单使用，后附 Whisper. mp3 -ar 16000 -ac 1 -c:a pcm_s16le output. make cleanmake -jcp bin/* . Nov 6, 2022 · Will ggml / whisper. cpp repo; From the whisper. Complie Whisper. 3, python 3. This major release includes the following changes: Full GPU processing of the Encoder and the Decoder with CUDA and Metal is now supported Apr 16, 2022 · WARNING - No GPU/TPU found, falling back to CPU. RTX 3090. / ``` Run all the examples as usual. Step 2 : 安裝whisper步驟. android: Android mobile application using whisper. For example, Whisper. 3× faster). Aug 1, 2023 · Now build whisper. I can run the stream method with the tiny model, but the latency is too high. Apple silicon is a first-class citizen - optimized via ARM NEON, Accelerate and Metal frameworks. OpenAI released Whisper in September 2022 as Open Source. self_int' is not currently supported on the MPS backend and will fall back to run on the CPU. For more control over the generation parameters, use the model + processor API directly: Ad-hoc generation arguments can be passed to model. cpp build info: I UNAME_S: Linux I UNAME_P: x86_64 I UNAME Skip to content Whisper. That is Whisper Open AI vs Whisper CPP vs Whisper Const May 10, 2024 · iOS mobile application using whisper. The reason why it went to “Welsh” on your accent is that it does autodetect language and output in that language. bobqianic added the question label on Nov 18, 2023. load_model("base", device="cuda") # If you are loading Whisper using Port of OpenAI's Whisper model in C/C++. b6344df. Mar 13, 2024 · Table 1: Whisper models, parameter sizes, and languages available. 04, Nvidia Jetpack 4. f589894. CPP is faster than Whisper on GPU for the tiny (1. cpp - Locally run an Instruction-Tuned Chat-Style LLM faster-whisper - Faster Whisper transcription with CTranslate2 Jun 21, 2023 · Purpose: These instructions cover the steps not explicitly set out on the main Whisper page, e. set_per_process_memory_fraction(), so it may not be actually reflecting what happens in e. Some updates: Dec 12, 2023 · You need to run WHISPER_CUBLAS=1 make stream. bin -f rhasspy/setkitchenlights20percent. 2. cpp directory, run: We would like to show you a description here but the site won’t allow us. cpp (GGUF), Llama models. CPUとGPUの両方で8 Jan 27, 2024 · whisper. In a provisional benchmark on Mac M1, distil-large-v3 is over 5x faster than Whisper large-v3, while performing to within 0. Runs gguf, trans Whisper is a Transformer based encoder-decoder model, also referred to as a sequence-to-sequence model. md files in Whisper. Encoder processing can be accelerated on the CPU via OpenBLAS. to get started. share/whisper-cppのディレクトリをexportすればOK ※brewのformulaを読むとggml-metal. Minimal example running fully in the browser. swiftui: SwiftUI iOS / macOS application using whisper. 1 is based on Whisper. cpp is compiled and ready to use. GPTQ-for-LLaMa - 4 bits quantization of LLaMA using GPTQ ggml - Tensor library for machine learning alpaca. 59 ms. cpp を知った際は、うちの初代ラズパイBでも動作するかなと期待したのですが、それなりにメモリは食うようなので断念。 ただ、GPU がない環境でも動くことが確認できたので、これからも色々試してみたいと思います。 Nov 19, 2023 · Whisper. 2. Oct 19, 2022 · Random (slightly adjusted) ChatGPT (GPT v4) advice that helped me. The large-v3 model is the one used in this article (source: openai/whisper-large-v3). Mar 6, 2012 · In this Subtitle Edit Tutorial, we'll look at the different Whisper Modes available in Subtitle Edit. 5x to 2x speedup compared to Openai’s Whisper model, but on my Intel i7-6700T only the tiny model sort of usable. 開啟Anaconda Prompt. 進入whisper環境 Apr 20, 2023 · I will share benchmarks and test results. Model: ggml-large-v3, lower is better. cpp repository: Abstract: Whisper is one of the recent state-of-the-art multilingual speech recognition and translation models, however, it is not designed for real-time transcription. I’ve been testing Whisper. cpp 1. May 2, 2023 · ちなみにwhisper高速化兄弟のwhisper-jaxだとGPUをほぼに使ってくれるので、RTX3600環境で10分の音源を3分程度で書き起こししてくれました。 GPU環境があるのであれば、whisper-jaxが最速の可能性があります。 faster-whisperもあるので、速度比較してみたいです。 May 20, 2023 · whisper. cppmake cleanWHISPER_CLBLAST=1 make -j. This implementation is up to 4 times faster than openai/whisper for the same accuracy while using less memory. time whisper --language en --model tiny. To be complete it was not working for me without others steps. 5 seconds for 30 seconds of real-time audio), this would only be useful if you was transcribing a large amount of audio (podcasts, movies, large amounts of audio files Apr 12, 2024 · Apr 12, 2024. The latter is not absolutely necessary but added as a workaround because the decoding logic assumes the outputs are in the same device as the encoder. cpp development by creating an account on GitHub. cpp is a custom inference implementation of the Whisper model. If you have other types of files. is_available() is False. please use ffmpeg -i input. g. Faster examples with accelerated inference. …. cpp ; mkdir build ; cd buildcmake -DWHISPER_CLBLAST=ON . CMake:cd whisper. on Apr 19, 2023. /main -m models/ggml-tiny. Here are the steps for creating and using a quantized model: Port of OpenAI's Whisper model in C/C++. Closed. Whisper Sample Code Apr 9, 2024 · I ran into the same problem. en medium ~5 GB ~2x. Author. Dec 20, 2022 · For CPU inference, model quantization is a very easy to apply method with great average speedups which is already built-in to PyTorch. 👉 Official Subtitle Edit Website 👉 https://nikse. medium 769 M medium. 今回は以下のモデルを使用したいと思います．. whisper开源 Apr 24, 2023 · 这里提供 Whisper 及 Whisper. 「音声認識モデル Whisper の推論をほぼ倍速に高速化した話」を参考に fp16 化 + no_grad Oct 7, 2022 · Whisper CPP がありました! libtorch や ONNX など使わず, 自前の ggml で model の forward 計算と, 自前で C++ で FFT 処理 (MEL spectrogram 計算) + Token decode していてしゅごい. for those who have never used python code/apps before and do not have the prerequisite software already installed. 0, CUDA 10. 8× faster) and base models (1. 2008. wav -t 8. 8, PyTorch 2. huapingchen mentioned this issue on May 13, 2023. anaconda安装无脑下一步就好 Jan 31, 2023 · この Whisper. Get a Mac-native version of Buzz with a cleaner look, audio playback, drag-and-drop import, transcript editing, search, and much more. I use a modified nix file, and add cudaPackages libcublas cudatoolkit in buildInputs and cuda_nvcc in nativeBuildInputs, also add env = { WHISPER_CUBLAS = "1"; }. モデルによっては，git-lftが必要になるかもしれません．. Self-hosted, community-driven and local-first. cpp is a lightweight intelligent speech recognition library, which is a port of the OpenAI Whisper model. Open your terminal again in the whisper. 0. Nov 16, 2022 · The code above uses register_forward_pre_hook to move the decoder's input to the second GPU ("cuda:1") and register_forward_hook to put the results back to the first GPU ("cuda:0"). Steps for getting started: Clone the Whisper. 13. Powered by OpenAI's Whisper. 8% WER over long-form audio. After a good bit of research I found that the main-cuda. However, the patch version is not tied to Whisper. 5B params). wav. RTX 3090 Advantage. Make sure that the server of Whisper. Dec 7, 2022 · OpenAIの高性能な音声認識モデルであるWhisperを、オフラインでかつGPUが無くても簡単に試せるようにしてくれたリポジトリを知ったのでご紹介。 Apr 11, 2023 · Windows11でPython版のWhisperを使いたかったけどPythonに触るのも久しぶりだったので色々調べながら。備忘録として残しておきます。 Jul 26, 2023 · 前一篇文章中 曾经介绍过 OpenAI 的开源模型 whisper，可以执行 99 种语言的语音识别和文字转写。 但是 whisper 模型占用计算资源多，命令行使用门槛高，所以还介绍了 whisper 模型的 c++ 实现：whisper. To integrate Whisper. CPU 推論はいろいろ CPU 専用命令使ってもそれなりにはかかります. 500. leuc on May 15, 2023. bobqianic added the solution This issue contains a potential We would like to show you a description here but the site won’t allow us. 2 (from unstable and 23. I tested openai-whisper-cpp 1. This may have performance implications. 0 is based on Whisper. cpp and server of llama. CPP is always much faster than Whisper on CPU, over 6 times faster for the tiny model up to over 7 times faster for the large one. metalをコピーしていたのでこれを指定している。 Closed. _ext. Not Found. cpp 在 Windows 上的实现，并增加了显卡的支持，使得速度大幅提升。 Apr 6, 2024 · opencl: enable OpenCL support. Mar 21, 2024 · Whisper. bobqianic added the question Further information is requested label Dec 15, 2023. 11), it works great with CPU. cpp running on a MacBook Pro M1 (CPU only) Hope you find this project interesting and let me know if you have any questions about the implementation. anandijain pushed a commit to anandijain/whisper. Share Add a Comment Mar 4, 2023 · 最終的に, fp16 だと GPU メモリ 4. dll files to the release, for added convenience. In this situation, as only exception to the description above, the value specified for '--gpu-architecture' may be a 'real' architecture (such as a sm_50), in which case nvcc uses the specified 'real' architecture and May 11, 2023 · En este vídeo veremos como instalar y usar whisper. We're using an Nvidia GPU with CUDA support, so our Supports transformers, GPTQ, AWQ, EXL2, llama. cpp folder in Finder using open . We're excited to announce WhisperScript v1. May 11, 2023 · Download OpenAI's Whisper. cpp (CPU) and openai-whisper (GPU), as well as code to visualize the benchmark results with matplotlib. anaconda：python环境管理工具 chocolatey：windows包管理工具. Requires calling Feb 7, 2024 · Jianningyuan commented on Feb 7. Switch between documentation themes. Quantized models require less memory and disk space and depending on the hardware can be processed more efficiently. Plain C/C++ implementation without any dependencies. en --device xpu tests/jfk. Oct 19, 2022 · I tried Whisper on a Jetson tx2 development kit (ubuntu 18. Plus, code to transcribe YouTube videos using whisper. brew install whisper-cpp. whisper是OpenAI公司出品的AI字幕神器，是目前最好的语音生成字幕工具之一，开源且支持本地部署，支持多种语言识别（英语识别准确率非常惊艳）。. Try to run it on that Veritasium video and see it for yourself. Assuming you want to use your GPU, the device should likely be 'cuda', and you may need to adjust the compute_type and othe Mar 28, 2023 · in theory if you are succeed doing the Core ML models you can have full advantage of any number of CPU, GPU and RAM allocated on your device because Core ML supports all the compute units available in your device: CPU, GPU and Apple's Neural Engine (NE). segmentation fault when use Core ML #919. GPUを使いたい場合は、 . cpp is to enable LLM inference with minimal setup and state-of-the-art performance on a wide variety of hardware - locally and in the cloud. cpp make clean WHISPER_CLBLAST=1 make -j CMake: cd whisper. Dec 8, 2022 · With much less RAM and slower M1 (non-Pro) processors, you can see the numbers declining a lot. cpp into your transcription workflow effectively, here’s a stepwise guide: 1. Nov 15, 2023 · Three weeks ago I discovered whisper. This is Unity3d bindings for the whisper. cpp on a Jetson Nano for a real-time speech recognition task. 但我的设备是有GPU的，tensorflow可以正常调用GPU。 Mar 12, 2023 · Whisper 是一个由 OpenAI 训练并开源的神经网络，在英语语音识别方面的稳健性和准确性接近人类水平。 whisper. Mar 27, 2024 · Then we simply call the Whisper model using our GPU instead of CPU: # If you are loading Whisper using GPU gpu_model = whisper. In this article, you will find the following: Whisper benchmarks and results opencl: enable OpenCL support. Nov 17, 2023 · Yes. cpp cmake -B build -DWHISPER_CLBLAST=ON cmake --build build -j --config Release Run all the examples as usual. Requires calling. . The English-only models were trained on the task of speech recognition. Link al articulo mi blog:https://construyendoachisp Port of OpenAI's Whisper model in C/C++. with model file in page cache. cpp with CLBlast support: Makefile: cd whisper. Whisper. As of now (2023/05/01), here’s an example flow to do this: Clone the whisper. The VRAM requirements are from simulations using torch. The availability of advanced technology and tools, in particular, AI is increasing at an ever-rapid rate, I am going to see just how easy it is to create an AI-powered real-time The main goal of llama. cpp and llama. 5 GB くらいあれば動きます. Might help others as well, YMMV:""" To resolve this issue, you should modify the instantiation of the ctranslate2. cpp repository to obtain the source code. BLAS CPU support via OpenBLAS. It's also possible for Core ML to run different portions of the model in different devices Jan 5, 2023 · With ffmpeg installed, you can now open your whisper. We should add these . $ . It’s a pure C library that converts models to run on several devices, including desktops, laptops, and even mobile device - and therefore, it can also be considered as a tinkering tool, trying new optimizations, that will then be incorporated into other downstream projects. cpp, 19 minutes audio transcribe, with Chinese Mandarin and English spoken. cpp : WASM example. a GPU with exactly 5 GB VRAM. 000 --> 00:07. cpp: whisper. cpp supports integer quantization of the Whisper ggml models. Whisper object in your code to correctly match the expected constructor arguments. No GPU required. Sep 21, 2022 · small 244 M small. flac. Begin by cloning the dedicated Whisper. 👍 2. net 1. o and also -lcudart -lcublas. @ggerganov, is there a reason why it's not included in the code? I'm completely unaware of the technical details of this topic, but I'd like to use GPU by We also provide an end-to-end Google Colab that benchmarks Whisper against Distil-Whisper. cpp does not treat OpenCL as a GPU, so it is always enabled at runtime. Overview. Feb 1, 2023 · Whisper. whisper. 輸入conda create — name whisper python=3. so). Jul 14, 2023 · I can confirm that the issue of not running in GPU on macOS M1 is still present. Usage instructions: Load a ggml model file (you can obtain one from here, recommended: tiny or base) Select audio file to transcribe or record audio from the microphone (sample: jfk. Follow the steps in the whisper. To get whisper up and runnig with cuda I had to do the following steps. yn gu pi cb ui jj us ha cu cz