rich7420 commented on code in PR #745:
URL: https://github.com/apache/mahout/pull/745#discussion_r2636966397
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qdp/qdp-python/src/lib.rs:
##########
@@ -94,8 +94,22 @@ impl QuantumTensor {
/// Returns:
/// Tuple of (device_type, device_id) where device_type=2 for CUDA
fn __dlpack_device__(&self) -> PyResult<(i32, i32)> {
- // DLDeviceType::kDLCUDA = 2, device_id = 0
- Ok((2, 0))
+ if self.ptr.is_null() {
+ return Err(PyRuntimeError::new_err("Invalid DLPack tensor
pointer"));
+ }
+
+ unsafe {
+ // Read device_id from DLPack tensor metadata
+ // DLDeviceType::kDLCUDA = 2 (from dlpack.h)
+ let tensor = &(*self.ptr).dl_tensor;
+ // device_type is an enum, convert to integer
+ // kDLCUDA = 2, kDLCPU = 1
Review Comment:
sure!
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