Expose logging-level functions

- Added functions for setting per-session and environment-wide logging
   levels. This allows me to remove the stdout message when the test
   fails to load the OpenVINO library.

onnxruntime_go.go

@@ -254,6 +254,21 @@ func EnableTelemetry() error {
 	return nil
 }
 
+// Sets the environmnent-wide log severity level. The argument must be one of
+// LoggingLevelVerbose, LoggingLevelInfo, LoggingLevelWarning,
+// LoggingLevelError, or LoggingLevelFatal. Must only be used after the
+// environment has been initialized.
+func SetEnvironmentLogLevel(level LoggingLevel) error {
+	if !IsInitialized() {
+		return NotInitializedError
+	}
+	status := C.UpdateEnvWithCustomLogLevel(ortEnv, C.OrtLoggingLevel(level))
+	if status != nil {
+		return statusToError(status)
+	}
+	return nil
+}
+
 // The Shape type holds the shape of the tensors used by the network input and
 // outputs.
 type Shape []int64
@@ -1307,6 +1322,17 @@ func (o *SessionOptions) SetGraphOptimizationLevel(
 	return nil
 }
 
+// Sets the sessions log severity level. Must be one of LoggingLevelVerbose,
+// LoggingLevelInfo, LoggingLevelWarning, LoggingLevelError, or
+// LoggingLevelFatal.
+func (o *SessionOptions) SetLogSeverityLevel(level LoggingLevel) error {
+	status := C.SetSessionLogSeverityLevel(o.o, C.int(level))
+	if status != nil {
+		return statusToError(status)
+	}
+	return nil
+}
+
 // Returns true, nil if the SessionOptions has a configuration entry with the
 // given key. Returns false if the key isn't defined. Returns an error if
 // onnxruntime indicates an error, though it isn't clear from the docs what

onnxruntime_test.go

@@ -1745,6 +1745,10 @@ func TestSessionOptions(t *testing.T) {
 	if e != nil {
 		t.Fatalf("Error setting memory pattern: %s\n", e)
 	}
+	e = options.SetLogSeverityLevel(LoggingLevelWarning)
+	if e != nil {
+		t.Fatalf("Error setting log severity level: %s\n", e)
+	}
 	testBigSessionWithOptions(t, options)
 }
 
@@ -2181,6 +2185,12 @@ func getOpenVINOSessionOptions(t testing.TB) *SessionOptions {
 	if e != nil {
 		t.Fatalf("Error creating session options: %s\n", e)
 	}
+	// OpenVINO prints messages to stdout simply for missing libraries. We
+	// don't want to clutter the test output, so reduce the logging level.
+	e = SetEnvironmentLogLevel(LoggingLevelFatal)
+	if e != nil {
+		t.Fatalf("Error reducing log severity level for OpenVINO: %s\n", e)
+	}
 	e = options.AppendExecutionProviderOpenVINO(map[string]string{})
 	if e != nil {
 		options.Destroy()