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use tract_data::internal::*;
pub fn multi_broadcast<D>(shapes: &[impl AsRef<[D]>]) -> Option<TVec<D>>
where
D: DimLike,
{
let one = D::one();
let len = shapes.iter().map(|shape| shape.as_ref().len()).max()?;
let mut shape: TVec<D> = tvec!();
for i in 0..len {
let mut wanted_size = D::one();
for shape in shapes {
let len = shape.as_ref().len();
let dim = if i < len { &shape.as_ref()[len - i - 1] } else { &one };
if dim != &D::one() {
if wanted_size != D::one() && dim != &wanted_size {
return None;
}
wanted_size = dim.clone();
}
}
shape.push(wanted_size)
}
shape.reverse();
Some(shape)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn onnx_1() {
assert_eq!(multi_broadcast(&tvec![tvec![2, 3, 4, 5], tvec![]]), Some(tvec![2, 3, 4, 5]))
}
#[test]
fn onnx_2() {
assert_eq!(multi_broadcast(&tvec![tvec![2, 3, 4, 5], tvec![5]]), Some(tvec![2, 3, 4, 5]))
}
#[test]
fn onnx_3() {
assert_eq!(multi_broadcast(&tvec![tvec![4, 5], tvec![2, 3, 4, 5]]), Some(tvec![2, 3, 4, 5]))
}
#[test]
fn onnx_4() {
assert_eq!(
multi_broadcast(&tvec![tvec![1, 4, 5], tvec![2, 3, 4, 1]]),
Some(tvec![2, 3, 4, 5])
)
}
#[test]
fn onnx_5() {
assert_eq!(
multi_broadcast(&tvec![tvec![3, 4, 5], tvec![2, 1, 1, 1]]),
Some(tvec![2, 3, 4, 5])
)
}
}