burn-tch 0.9.0

Tch backend for the Burn framework
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use super::element::TchElement;
use super::TchTensor;
use burn_tensor::backend::Backend;

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
/// The device struct when using the `tch` backend.
///
/// Note that you need to provide the device index when using Cuda.
///
/// # Example
///
/// ```no_run
/// use burn_tch::TchDevice;
///
/// let device_gpu_1 = TchDevice::Cuda(0); // First GPU
/// let device_gpu_2 = TchDevice::Cuda(1); // Second GPU
/// let device_cpu = TchDevice::Cpu; // CPU
/// let device_mps = TchDevice::Mps; // Metal Performance Shaders
/// let device_vulkan = TchDevice::Vulkan; // Vulkan
/// ```
pub enum TchDevice {
    /// CPU device.
    Cpu,

    /// Cuda device with the given index. The index is the index of the Cuda device in the list of
    /// all Cuda devices found on the system.
    Cuda(usize),

    /// Metal Performance Shaders device.
    Mps,

    /// Vulkan device.
    Vulkan,
}

impl From<TchDevice> for tch::Device {
    fn from(device: TchDevice) -> Self {
        match device {
            TchDevice::Cpu => tch::Device::Cpu,
            TchDevice::Cuda(num) => tch::Device::Cuda(num),
            TchDevice::Mps => tch::Device::Mps,
            TchDevice::Vulkan => tch::Device::Vulkan,
        }
    }
}

impl From<tch::Device> for TchDevice {
    fn from(device: tch::Device) -> Self {
        match device {
            tch::Device::Cpu => TchDevice::Cpu,
            tch::Device::Cuda(num) => TchDevice::Cuda(num),
            tch::Device::Mps => TchDevice::Mps,
            tch::Device::Vulkan => TchDevice::Vulkan,
        }
    }
}

impl Default for TchDevice {
    fn default() -> Self {
        Self::Cpu
    }
}

/// The Tch backend.
#[derive(Clone, Copy, Default, Debug)]
pub struct TchBackend<E> {
    _e: E,
}

impl<E: TchElement> Backend for TchBackend<E> {
    type Device = TchDevice;
    type FullPrecisionElem = f32;
    type FullPrecisionBackend = TchBackend<f32>;

    type TensorPrimitive<const D: usize> = TchTensor<E, D>;
    type FloatElem = E;

    type IntTensorPrimitive<const D: usize> = TchTensor<i64, D>;
    type IntElem = i64;

    type BoolTensorPrimitive<const D: usize> = TchTensor<bool, D>;

    fn seed(seed: u64) {
        tch::manual_seed(seed as i64);
    }

    fn ad_enabled() -> bool {
        false
    }

    fn name() -> String {
        "tch".to_string()
    }
}