use std::mem::size_of;
use ndarray::{array, s, Array1, Dim};
use numpy::{
dtype, get_array_module, pyarray, PyArray, PyArray1, PyArray2, PyArrayDescr, PyArrayDyn,
ToPyArray,
};
use pyo3::{
py_run, pyclass, pymethods,
types::{IntoPyDict, PyDict, PyList},
Py, PyAny, PyCell, PyResult, Python,
};
fn get_np_locals(py: Python) -> &PyDict {
[("np", get_array_module(py).unwrap())].into_py_dict(py)
}
fn not_contiguous_array(py: Python) -> &PyArray1<i32> {
py.eval(
"np.array([1, 2, 3, 4], dtype='int32')[::2]",
None,
Some(get_np_locals(py)),
)
.unwrap()
.downcast()
.unwrap()
}
#[test]
fn new_c_order() {
Python::with_gil(|py| {
let dims = [3, 5];
let arr = PyArray::<f64, _>::zeros(py, dims, false);
assert!(arr.ndim() == 2);
assert!(arr.dims() == dims);
let size = size_of::<f64>() as isize;
assert!(arr.strides() == [dims[1] as isize * size, size]);
});
}
#[test]
fn new_fortran_order() {
Python::with_gil(|py| {
let dims = [3, 5];
let arr = PyArray::<f64, _>::zeros(py, dims, true);
assert!(arr.ndim() == 2);
assert!(arr.dims() == dims);
let size = size_of::<f64>() as isize;
assert!(arr.strides() == [size, dims[0] as isize * size],);
});
}
#[test]
fn tuple_as_dim() {
Python::with_gil(|py| {
let dims = (3, 5);
let arr = PyArray::<f64, _>::zeros(py, dims, false);
assert!(arr.ndim() == 2);
assert!(arr.dims() == [3, 5]);
});
}
#[test]
fn zeros() {
Python::with_gil(|py| {
let dims = [3, 4];
let arr = PyArray::<f64, _>::zeros(py, dims, false);
assert!(arr.ndim() == 2);
assert!(arr.dims() == dims);
let size = size_of::<f64>() as isize;
assert!(arr.strides() == [dims[1] as isize * size, size]);
let arr = PyArray::<f64, _>::zeros(py, dims, true);
assert!(arr.ndim() == 2);
assert!(arr.dims() == dims);
let size = size_of::<f64>() as isize;
assert!(arr.strides() == [size, dims[0] as isize * size]);
});
}
#[test]
fn arange() {
Python::with_gil(|py| {
let arr = PyArray::<f64, _>::arange(py, 0.0, 1.0, 0.1);
assert_eq!(arr.ndim(), 1);
assert_eq!(arr.dims(), Dim([10]));
});
}
#[test]
fn as_array() {
Python::with_gil(|py| {
let pyarr = PyArray::<f64, _>::zeros(py, [3, 2, 4], false).readonly();
let arr = pyarr.as_array();
assert_eq!(pyarr.shape(), arr.shape());
assert_eq!(
pyarr
.strides()
.iter()
.map(|x| x / size_of::<f64>() as isize)
.collect::<Vec<_>>(),
arr.strides()
);
let not_contiguous = not_contiguous_array(py).readonly();
assert_eq!(not_contiguous.as_array(), array![1, 3]);
});
}
#[test]
fn as_raw_array() {
Python::with_gil(|py| {
let not_contiguous = not_contiguous_array(py);
let raw_array_view = not_contiguous.as_raw_array();
assert_eq!(unsafe { raw_array_view.deref_into_view()[0] }, 1);
let raw_array_view_mut = not_contiguous.as_raw_array_mut();
assert_eq!(unsafe { raw_array_view_mut.deref_into_view_mut()[1] }, 3);
});
}
#[test]
fn as_slice() {
Python::with_gil(|py| {
let arr = PyArray::<i32, _>::zeros(py, [3, 2, 4], false);
assert_eq!(arr.readonly().as_slice().unwrap().len(), 3 * 2 * 4);
let not_contiguous = not_contiguous_array(py);
let err = not_contiguous.readonly().as_slice().unwrap_err();
assert_eq!(err.to_string(), "The given array is not contiguous");
});
}
#[test]
fn is_instance() {
Python::with_gil(|py| {
let arr = PyArray2::<f64>::zeros(py, [3, 5], false);
assert!(arr.is_instance_of::<PyArray2<f64>>().unwrap());
assert!(!arr.is_instance_of::<PyList>().unwrap());
});
}
#[test]
fn from_vec2() {
Python::with_gil(|py| {
let vec2 = vec![vec![1, 2, 3]; 2];
let pyarray = PyArray::from_vec2(py, &vec2).unwrap();
assert_eq!(pyarray.readonly().as_array(), array![[1, 2, 3], [1, 2, 3]]);
});
}
#[test]
fn from_vec2_ragged() {
Python::with_gil(|py| {
let pyarray = PyArray::from_vec2(py, &[vec![1], vec![2, 3]]);
let err = pyarray.unwrap_err();
assert_eq!(err.to_string(), "invalid length: 1, but expected 2");
});
}
#[test]
fn from_vec3() {
Python::with_gil(|py| {
let vec3 = vec![vec![vec![1, 2]; 2]; 2];
let pyarray = PyArray::from_vec3(py, &vec3).unwrap();
assert_eq!(
pyarray.readonly().as_array(),
array![[[1, 2], [1, 2]], [[1, 2], [1, 2]]]
);
});
}
#[test]
fn from_vec3_ragged() {
Python::with_gil(|py| {
let pyarray = PyArray::from_vec3(py, &[vec![vec![1], vec![2, 3]]]);
let err = pyarray.unwrap_err();
assert_eq!(err.to_string(), "invalid length: 1, but expected 2");
});
}
#[test]
fn extract_as_fixed() {
Python::with_gil(|py| {
let locals = get_np_locals(py);
let pyarray: &PyArray1<i32> = py
.eval("np.array([1, 2, 3], dtype='int32')", Some(locals), None)
.unwrap()
.extract()
.unwrap();
assert_eq!(pyarray.readonly().as_array(), array![1, 2, 3]);
});
}
#[test]
fn extract_as_dyn() {
Python::with_gil(|py| {
let locals = get_np_locals(py);
let pyarray: &PyArrayDyn<i32> = py
.eval(
"np.array([[1, 2], [3, 4]], dtype='int32')",
Some(locals),
None,
)
.unwrap()
.extract()
.unwrap();
assert_eq!(
pyarray.readonly().as_array(),
array![[1, 2], [3, 4]].into_dyn()
);
});
}
#[test]
fn extract_fail_by_dim() {
Python::with_gil(|py| {
let locals = get_np_locals(py);
let pyarray: PyResult<&PyArray2<i32>> = py
.eval("np.array([1, 2, 3], dtype='int32')", Some(locals), None)
.unwrap()
.extract();
let err = pyarray.unwrap_err();
assert_eq!(
err.to_string(),
"TypeError: dimensionality mismatch:\n from=1, to=2"
);
});
}
#[test]
fn extract_fail_by_dtype() {
Python::with_gil(|py| {
let locals = get_np_locals(py);
let pyarray: PyResult<&PyArray1<i32>> = py
.eval("np.array([1, 2, 3], dtype='float64')", Some(locals), None)
.unwrap()
.extract();
let err = pyarray.unwrap_err();
assert_eq!(
err.to_string(),
"TypeError: type mismatch:\n from=float64, to=int32"
);
});
}
#[test]
fn array_cast() {
Python::with_gil(|py| {
let arr_f64 = pyarray![py, [1.5, 2.5, 3.5], [1.5, 2.5, 3.5]];
let arr_i32: &PyArray2<i32> = arr_f64.cast(false).unwrap();
assert_eq!(arr_i32.readonly().as_array(), array![[1, 2, 3], [1, 2, 3]]);
});
}
#[test]
fn handle_negative_strides() {
Python::with_gil(|py| {
let arr = array![[2, 3], [4, 5u32]];
let pyarr = arr.to_pyarray(py);
let neg_str_pyarr: &PyArray2<u32> = py
.eval("a[::-1]", Some([("a", pyarr)].into_py_dict(py)), None)
.unwrap()
.downcast()
.unwrap();
assert_eq!(
neg_str_pyarr.readonly().as_array(),
arr.slice(s![..;-1, ..])
);
});
}
#[test]
fn dtype_via_python_attribute() {
Python::with_gil(|py| {
let arr = array![[2, 3], [4, 5u32]];
let pyarr = arr.to_pyarray(py);
let dt: &PyArrayDescr = py
.eval("a.dtype", Some([("a", pyarr)].into_py_dict(py)), None)
.unwrap()
.downcast()
.unwrap();
assert!(dt.is_equiv_to(dtype::<u32>(py)));
});
}
#[test]
fn borrow_from_array_works() {
#[pyclass]
struct Owner {
array: Array1<f64>,
}
#[pymethods]
impl Owner {
#[getter]
fn array(this: &PyCell<Self>) -> &PyArray1<f64> {
let array = &this.borrow().array;
unsafe { PyArray1::borrow_from_array(array, this) }
}
}
let array = Python::with_gil(|py| {
let owner = Py::new(
py,
Owner {
array: Array1::linspace(0., 1., 10),
},
)
.unwrap();
owner.getattr(py, "array").unwrap()
});
Python::with_gil(|py| {
py_run!(py, array, "assert array.shape == (10,)");
});
}
#[test]
fn downcasting_works() {
Python::with_gil(|py| {
let ob: &PyAny = PyArray::from_slice(py, &[1_i32, 2, 3]);
assert!(ob.downcast::<PyArray1<i32>>().is_ok());
});
}
#[test]
fn downcasting_respects_element_type() {
Python::with_gil(|py| {
let ob: &PyAny = PyArray::from_slice(py, &[1_i32, 2, 3]);
assert!(ob.downcast::<PyArray1<f64>>().is_err());
});
}
#[test]
fn downcasting_respects_dimensionality() {
Python::with_gil(|py| {
let ob: &PyAny = PyArray::from_slice(py, &[1_i32, 2, 3]);
assert!(ob.downcast::<PyArray2<i32>>().is_err());
});
}