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# OpenVINO™ Python* openvino.tools package
## General
`openvino.tools` package includes:
* openvino.tools.accuracy_checker
* openvino.tools.benchmark
* openvino.tools.calibration
* openvino.tools.utils
Please, refer to https://docs.openvinotoolkit.org for details.
## Installation
Choose neccessary Python\* version and define `PYTHONPATH` environment variable.
### Prerequisites
Install prerequisites first:
#### 1. Python
**openvino.tools** is **Python 3** library. Install it first:
- [Python3][python3]
- [setuptools][setuptools]
```bash
sudo apt-get install python3 python3-dev python3-setuptools python3-pip
```
Python setuptools and python package manager (pip) install packages into system directory by default. There are several options:
- work inside [virtual environment][virtualenv] (best solution).
- use `--user` option for all `pip` commands.
- install all dependencies with *sudo* permissions.
In order to use virtual environment you should install it:
```bash
python3 -m pip install virtualenv
python3 -m virtualenv -p `which python3` <directory_for_environment>
```
Before starting to work inside virtual environment, it should be activated:
```bash
source <directory_for_environment>/bin/activate
```
Virtual environment can be deactivated using command
```bash
deactivate
```
#### 2. Install package prerequisites
The next step is installing package prerequisites.
```bash
python3 -m pip install -r benchmark/requirements.txt calibration/requirements.txt
```
### Configuration
Each subpackage has specific configuration. Please, refer to specific subpackage documentation for details.
[python3]: https://www.python.org/downloads/
[setuptools]: https://pypi.python.org/pypi/setuptools
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