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use ::candle::Tensor;
use pyo3::prelude::*;
#[derive(Clone, Debug)]
/// Represents an absolute shape e.g. (1, 2, 3)
pub struct PyShape(Vec<usize>);
impl<'source> pyo3::FromPyObject<'source> for PyShape {
fn extract(ob: &'source PyAny) -> PyResult<Self> {
if ob.is_none() {
return Err(PyErr::new::<pyo3::exceptions::PyValueError, _>(
"Shape cannot be None",
));
}
let tuple = ob.downcast::<pyo3::types::PyTuple>()?;
if tuple.len() == 1 {
let first_element = tuple.get_item(0)?;
let dims: Vec<usize> = pyo3::FromPyObject::extract(first_element)?;
Ok(PyShape(dims))
} else {
let dims: Vec<usize> = pyo3::FromPyObject::extract(tuple)?;
Ok(PyShape(dims))
}
}
}
impl From<PyShape> for ::candle::Shape {
fn from(val: PyShape) -> Self {
val.0.into()
}
}
#[derive(Clone, Debug)]
/// Represents a shape with a hole in it e.g. (1, -1, 3)
pub struct PyShapeWithHole(Vec<isize>);
impl<'source> pyo3::FromPyObject<'source> for PyShapeWithHole {
fn extract(ob: &'source PyAny) -> PyResult<Self> {
if ob.is_none() {
return Err(PyErr::new::<pyo3::exceptions::PyValueError, _>(
"Shape cannot be None",
));
}
let tuple = ob.downcast::<pyo3::types::PyTuple>()?;
let dims: Vec<isize> = if tuple.len() == 1 {
let first_element = tuple.get_item(0)?;
pyo3::FromPyObject::extract(first_element)?
} else {
pyo3::FromPyObject::extract(tuple)?
};
// Ensure we have only positive numbers and at most one "hole" (-1)
let negative_ones = dims.iter().filter(|&&x| x == -1).count();
let any_invalid_dimensions = dims.iter().any(|&x| x < -1 || x == 0);
if negative_ones > 1 || any_invalid_dimensions {
return Err(PyErr::new::<pyo3::exceptions::PyValueError, _>(format!(
"Invalid dimension in shape: {:?}",
dims
)));
}
Ok(PyShapeWithHole(dims))
}
}
impl PyShapeWithHole {
/// Returns `true` if the shape is absolute e.g. (1, 2, 3)
pub fn is_absolute(&self) -> bool {
self.0.iter().all(|x| *x > 0)
}
/// Convert a relative shape to an absolute shape e.g. (1, -1) -> (1, 12)
pub fn to_absolute(&self, t: &Tensor) -> PyResult<PyShape> {
if self.is_absolute() {
return Ok(PyShape(
self.0.iter().map(|x| *x as usize).collect::<Vec<usize>>(),
));
}
let mut elements = t.elem_count();
let mut new_dims: Vec<usize> = vec![];
for dim in self.0.iter() {
if *dim > 0 {
new_dims.push(*dim as usize);
elements /= *dim as usize;
} else if *dim == -1 {
new_dims.push(elements);
} else {
return Err(PyErr::new::<pyo3::exceptions::PyValueError, _>(format!(
"Invalid dimension in shape: {}",
dim
)));
}
}
Ok(PyShape(new_dims))
}
}
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