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the `attributeerror: module 'cv2' has no attribute 'face'` error typically occurs when you are trying to access the `face` module in opencv, but it is not available in the version of opencv you have installed. the `face` module is part of the opencv contrib package, which contains additional modules that are not included in the main opencv package.

here's a step-by-step tutorial on how to resolve this issue and use the `cv2.face` module correctly.

step 1: install opencv with contrib modules

to access the `cv2.face` module, you need to install opencv with the contrib modules. you can do this using pip. you have two options here:

option 1: install via pip
you can install the pre-built package that includes contrib modules.

```bash
pip install opencv-contrib-python
```

option 2: build from source
if you need the latest version or want to customize the build, you can build opencv from source. here’s a quick outline of how to do that:

1. *clone the opencv and opencv contrib repositories:*

```bash
git clone https://github.com/opencv/opencv.git
git clone https://github.com/opencv/opencv_cont...
```

2. *create a build directory:*

```bash
cd opencv
mkdir build
cd build
```

3. *configure the build with cmake:*

```bash
cmake -dopencv_extra_modules_path=../../opencv_contrib/modules ..
```

4. *compile and install:*

```bash
make -j8 use the number of cores on your machine for faster compilation
sudo make install
```

step 2: verify installation

after installation, you can check if the `cv2.face` module is available by running the following code:

```python
import cv2

print(dir(cv2.face))
```

if you do not see an error and the list contains attributes like `eigenfacerecognizer`, `fisherfacerecognizer`, or `lbphfacerecognizer`, then the installation was successful.

step 3: example code using cv2.face

here’s a simple example demonstrating how to use the `cv2.face` module to create a face recognizer ...

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