Add "xpu" device tag to the device list to support Intel GPU (#428)

* Support XPU device

* Fmt.

---------

Co-authored-by: Jiong Gong <jiong.gong@intel.com>

bindings/python/src/lib.rs

@@ -226,6 +226,7 @@ enum Device {
     Cuda(usize),
     Mps,
     Npu(usize),
+    Xpu(usize),
 }
 
 impl<'source> FromPyObject<'source> for Device {
@@ -236,6 +237,7 @@ impl<'source> FromPyObject<'source> for Device {
                 "cuda" => Ok(Device::Cuda(0)),
                 "mps" => Ok(Device::Mps),
                 "npu" => Ok(Device::Npu(0)),
+                "xpu" => Ok(Device::Xpu(0)),
                 name if name.starts_with("cuda:") => {
                     let tokens: Vec<_> = name.split(':').collect();
                     if tokens.len() == 2 {
@@ -258,6 +260,17 @@ impl<'source> FromPyObject<'source> for Device {
                         )))
                     }
                 }
+                name if name.starts_with("xpu:") => {
+                    let tokens: Vec<_> = name.split(':').collect();
+                    if tokens.len() == 2 {
+                        let device: usize = tokens[1].parse()?;
+                        Ok(Device::Xpu(device))
+                    } else {
+                        Err(SafetensorError::new_err(format!(
+                            "device {name} is invalid"
+                        )))
+                    }
+                }
                 name => Err(SafetensorError::new_err(format!(
                     "device {name} is invalid"
                 ))),
@@ -277,6 +290,7 @@ impl IntoPy<PyObject> for Device {
             Device::Cuda(n) => format!("cuda:{n}").into_py(py),
             Device::Mps => "mps".into_py(py),
             Device::Npu(n) => format!("npu:{n}").into_py(py),
+            Device::Xpu(n) => format!("xpu:{n}").into_py(py),
         }
     }
 }