How to add external python libraries as dependencies inside my Rust application? I am getting error while trying to call a function from a python file that uses numpy and scikit-learn

[priyas2024]

Hello all,
Inside my rust application I am trying to call a simple function that runs a linear regression model and returns the predictions. This function uses the scikit-learn and numpy functions. I am trying to add the dependencies inside the pyproject.toml and use the maturin build. While running the rust function where the function call is made I am getting the NoModuleError for numpy.

Error: PyErr { type: <class 'ModuleNotFoundError'>, value: ModuleNotFoundError("No module named 'numpy'"), traceback: Some(<traceback object at 0x000001FD12E5D840>) }
error: process didn't exit successfully: target\debug\rust_python3.exe (exit code: 1)

This is my pyproject.toml

[build-system]
requires = ["maturin>=1,<2"]
build-backend = "maturin"

[project]
name = "rust_python"
version = "0.1.0"
dependencies = [
    "numpy",
    "scikit-learn == 1.1.3",
]

I am following the Pyo3 user guide example where we call an existing function inside a python file.

let from_python = Python::with_gil(|py| -> PyResult<Py<PyAny>> {
        PyModule::from_code_bound(py, py_ml, "utils.mlcheck","utils.mlcheck")?;
        let app: Py<PyAny> = PyModule::from_code_bound(py, py_app, "", "")?
            .getattr("run")?
            .into();
    //let args=(x,y);
        app.call0(py)
    });

I am following the below steps to run the application

1. pip install .
   to install all the dependencies
2. cargo build
   to build the application
3. cargo run
   to run the rust application's main.rs from where the call to the python function is made
   I don't see any compile time errors. And the build completes without any issues.
   Any help would be very much appreciated.

[davidhewitt]

What OS are you using? Might be a duplicate of #1741