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use super::Tensor;
use crate::{kind::Element, TchError};
use half::f16;
use std::convert::{TryFrom, TryInto};
impl<T: Element> From<&Tensor> for Vec<T> {
fn from(tensor: &Tensor) -> Vec<T> {
let numel = tensor.numel();
let mut vec = vec![T::ZERO; numel];
tensor.to_device(crate::Device::Cpu).to_kind(T::KIND).copy_data(&mut vec, numel);
vec
}
}
impl<T: Element> From<&Tensor> for Vec<Vec<T>> {
fn from(tensor: &Tensor) -> Vec<Vec<T>> {
let first_dim = tensor.size()[0];
(0..first_dim).map(|i| Vec::<T>::from(tensor.get(i))).collect()
}
}
impl<T: Element> From<&Tensor> for Vec<Vec<Vec<T>>> {
fn from(tensor: &Tensor) -> Vec<Vec<Vec<T>>> {
let first_dim = tensor.size()[0];
(0..first_dim).map(|i| Vec::<Vec<T>>::from(tensor.get(i))).collect()
}
}
impl<T: Element> From<Tensor> for Vec<T> {
fn from(tensor: Tensor) -> Vec<T> {
Vec::<T>::from(&tensor)
}
}
impl<T: Element> From<Tensor> for Vec<Vec<T>> {
fn from(tensor: Tensor) -> Vec<Vec<T>> {
Vec::<Vec<T>>::from(&tensor)
}
}
impl<T: Element> From<Tensor> for Vec<Vec<Vec<T>>> {
fn from(tensor: Tensor) -> Vec<Vec<Vec<T>>> {
Vec::<Vec<Vec<T>>>::from(&tensor)
}
}
macro_rules! from_tensor {
($typ:ident) => {
impl From<&Tensor> for $typ {
fn from(tensor: &Tensor) -> $typ {
let numel = tensor.numel();
if numel != 1 {
panic!("expected exactly one element, got {}", numel)
}
Vec::from(tensor)[0]
}
}
impl From<Tensor> for $typ {
fn from(tensor: Tensor) -> $typ {
$typ::from(&tensor)
}
}
};
}
from_tensor!(f64);
from_tensor!(f32);
from_tensor!(f16);
from_tensor!(i64);
from_tensor!(i32);
from_tensor!(i8);
from_tensor!(u8);
from_tensor!(bool);
impl<T: Element> TryInto<ndarray::ArrayD<T>> for &Tensor {
type Error = ndarray::ShapeError;
fn try_into(self) -> Result<ndarray::ArrayD<T>, Self::Error> {
let v: Vec<T> = self.into();
let shape: Vec<usize> = self.size().iter().map(|s| *s as usize).collect();
ndarray::ArrayD::from_shape_vec(ndarray::IxDyn(&shape), v)
}
}
impl<T, D> TryFrom<&ndarray::ArrayBase<T, D>> for Tensor
where
T: ndarray::Data,
T::Elem: Element,
D: ndarray::Dimension,
{
type Error = TchError;
fn try_from(value: &ndarray::ArrayBase<T, D>) -> Result<Self, Self::Error> {
let slice = value
.as_slice()
.ok_or_else(|| TchError::Convert("cannot convert to slice".to_string()))?;
let tn = Self::f_of_slice(slice)?;
let shape: Vec<i64> = value.shape().iter().map(|s| *s as i64).collect();
tn.f_reshape(&shape)
}
}
impl<T, D> TryFrom<ndarray::ArrayBase<T, D>> for Tensor
where
T: ndarray::Data,
T::Elem: Element,
D: ndarray::Dimension,
{
type Error = TchError;
fn try_from(value: ndarray::ArrayBase<T, D>) -> Result<Self, Self::Error> {
Self::try_from(&value)
}
}
impl<T: Element> TryFrom<&Vec<T>> for Tensor {
type Error = TchError;
fn try_from(value: &Vec<T>) -> Result<Self, Self::Error> {
Self::f_of_slice(value.as_slice())
}
}
impl<T: Element> TryFrom<Vec<T>> for Tensor {
type Error = TchError;
fn try_from(value: Vec<T>) -> Result<Self, Self::Error> {
Self::try_from(&value)
}
}