Some typo fixes

cuda/external.go

@@ -93,7 +93,7 @@ func (e *Engine) Init(device cu.Device, size int64) (err error) {
 		e.Unlock()
 		err2 := e.Close()
 		if err2 != nil {
-			return errors.Wrapf(err, "Failed to initialize CUDA Engine with size %d for device %v. Additionally, there were errors that occured when cleaning up %v", size, device, err)
+			return errors.Wrapf(err, "Failed to initialize CUDA Engine with size %d for device %v. Additionally, there were errors that occurred when cleaning up %v", size, device, err)
 		}
 		return errors.Wrapf(err, "Failed to initialize CUDA Engine with size %d for device %v", size, device)
 	}

errors.go

@@ -78,7 +78,7 @@ func checkErrSetDeriv(err error, dv *dualValue) error {
 	return err
 }
 
-// SymDiffError provides the context at which an error occured
+// SymDiffError provides the context at which an error occurred
 type SymDiffError struct {
 	nodes   Nodes
 	single  *Node

node_set.go

@@ -148,7 +148,7 @@ func (set NodeSet) Iter() <-chan *Node {
 
 // Equal determines if two sets are equal to each other.
 // If they both are the same size and have the same items they are considered equal.
-// Order of items is not relevent for sets to be equal.
+// Order of items is not relevant for sets to be equal.
 func (set NodeSet) Equal(other NodeSet) bool {
 	if set.Cardinality() != other.Cardinality() {
 		return false

solvers_test.go

@@ -112,7 +112,7 @@ func manualRMSProp32(t *testing.T, s *RMSPropSolver, model []ValueGrad) {
 	eps := float32(s.eps)
 	clip := float32(s.clip)
 
-	// NOTE: THIS IS NAUGHTY. A proper comparsion using 1e-5  should be used but that causes errors.
+	// NOTE: THIS IS NAUGHTY. A proper comparison using 1e-5  should be used but that causes errors.
 	closef32 := func(a, b float32) bool {
 		return dawson.ToleranceF32(a, b, 1e-4)
 	}