feat(tensor/patched): add NLLLoss

tensor/patch.go

@@ -152,3 +152,36 @@ func (ts Tensor) MustTopK(k int64, dim int64, largest bool, sorted bool) (ts1 Te
 
 	return ts1, ts2
 }
+
+// NOTE. `NLLLoss` is a version of `NllLoss` in tensor-generated
+// with default weight, reduction and ignoreIndex
+func (ts Tensor) NLLLoss(target Tensor, del bool) (retVal Tensor, err error) {
+	ptr := (*lib.Ctensor)(unsafe.Pointer(C.malloc(0)))
+	if del {
+		defer ts.MustDrop()
+	}
+
+	weight := NewTensor()
+
+	reduction := int64(1) // Mean of loss
+	ignoreIndex := int64(-100)
+	defer C.free(unsafe.Pointer(ptr))
+
+	lib.AtgNLLLoss(ptr, ts.ctensor, target.ctensor, weight.ctensor, reduction, ignoreIndex)
+	if err = TorchErr(); err != nil {
+		return retVal, err
+	}
+
+	retVal = Tensor{ctensor: *ptr}
+
+	return retVal, nil
+}
+
+func (ts Tensor) MustNllLoss(target Tensor, del bool) (retVal Tensor) {
+	retVal, err := ts.NllLoss(target, del)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return retVal
+}