# Quantagonia API Client
This package contains Quantagonia's CLI client and client-side APIs for using HybridSolver in the cloud.
## Installation
Python >= 3.8 is required. Then, do
```
python -m pip install quantagonia-api-client
```
In order to use HybridSolver through Quantagonia's cloud system, you'll need to sign up for an API key and set it system-wide by
```
export QUANTAGONIA_API_KEY=<your API key here>
```
## Quick start: using the CLI client
This package provides the script `hybridsolver` to interact with the
cloud solver. In order to solve a MIP (supported formats: `.mps, .lp,
.mps.gz, .lp.gz`) or QUBO (spported formats: `.qubo, .qubo.gz`), just
use
```
hybridsolver solve path/to/example.mps
```
which will automatically set all parameters and solver controls to their default value, which is a good compromise for many middle-sized
optimization problems out there.
The `solve` call has a few options (try `hybridsolver solve --help`) and will, after submitting the problem, stream the logs and output the
solution vector if one is found.
To start a job without attaching to its log stream and leave it running in the background, use
```
hybridsolver submit path/to/example.mps
```
which supports the same parameters as `solve` and returns a `job_id`.
using this ID, logs, results and job status as well as time billed can
be retrieved using
```
hybridsolver (logs | solution | status | time_billed) job_id
```
Lastly, in order to cancel a runnning job and avoid unnecessary
costs, use `hybridsolver cancel job_id`. To list `k` active and/or past jobs,
use `hybridsolver list --n=k`.
## Using the API client in your own code
The capabilities of the API client include, but are not limited to:
- a plugin for PuLP to solve PuLP-generated models locally and in the client,
- a simple API to model QUBOs locally and solve them in the cloud and
- an importer to convert PyQUBO models into our format - allowing to solve PyQUBO models in QUantagonia's cloud.
For starters, you can run the examples in `examples/` through, e.g.,
```
QUANTAGONIA_API_KEY="<redacted>" python examples/submit_qubo.py
```
with a valid Quantagonia API key.
For more details, we refer to our [API reference](https://docs.quantagonia.com).
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