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# Install opt_einsum
You can install `opt_einsum` with `conda`, with `pip`, or by installing from source.
## Conda
You can update `opt_einsum` using [`conda`](https://www.anaconda.com/download/):
```bash
conda install opt_einsum -c conda-forge
```
This installs `opt_einsum` and the NumPy dependency.
The `opt_einsum` package is maintained on the [conda-forge channel](https://conda-forge.github.io/).
## Pip
To install `opt_einsum` with `pip` there are a few options, depending on which
dependencies you would like to keep up to date:
* `pip install opt_einsum`
## Install from Source
To install opt_einsum from source, clone the repository from [github](https://github.com/dgasmith/opt_einsum):
```bash
git clone https://github.com/dgasmith/opt_einsum.git
cd opt_einsum
python setup.py install
```
or use `pip` locally if you want to install all dependencies as well::
```bash
pip install -e .
```
## Test
Test `opt_einsum` with `py.test`:
```bash
cd opt_einsum
pytest
```
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