Add close methods to all tasks

Issue:
There is no option to free up resources used by a model, thus leadning
to a a memory leak

Changes:
- Add a method that satisifies the closer interface to all tasks
- Done in the same way the method was added to "Text2Text"
- This allows for users that load the model to free up resources when
finished.

pkg/tasks/languagemodeling/bert/languagemodel.go

@@ -77,6 +77,12 @@ func LoadMaskedLanguageModel(modelPath string) (*LanguageModel, error) {
 	}, nil
 }
 
+// Close finalizes the LanguageModel resources.
+// It satisfies the interface io.Closer.
+func (m *LanguageModel) Close() error {
+	return m.embeddingsRepo.Close()
+}
+
 // Predict returns the predicted tokens
 func (m *LanguageModel) Predict(_ context.Context, text string, parameters languagemodeling.Parameters) (languagemodeling.Response, error) {
 	if parameters.K == 0 {

pkg/tasks/questionanswering/bert/questionanswering.go

@@ -72,6 +72,12 @@ func LoadQuestionAnswering(modelPath string) (*QuestionAnswering, error) {
 	}, nil
 }
 
+// Close finalizes the QuestionAnswering resources.
+// It satisfies the interface io.Closer.
+func (qa *QuestionAnswering) Close() error {
+	return qa.embeddingsRepo.Close()
+}
+
 // Answer returns the answers for the given question and passage.
 // The options may assume default values if those are not set.
 func (qa *QuestionAnswering) Answer(_ context.Context, question string, passage string, opts *questionanswering.Options) (questionanswering.Response, error) {

pkg/tasks/textclassification/bert/textclassification.go

@@ -97,6 +97,12 @@ func ID2Label(value map[string]string) []string {
 	return y
 }
 
+// Close finalizes the TextClassification resources.
+// It satisfies the interface io.Closer.
+func (m *TextClassification) Close() error {
+	return m.embeddingsRepo.Close()
+}
+
 // Classify returns the classification of the given text.
 func (m *TextClassification) Classify(_ context.Context, text string) (textclassification.Response, error) {
 	tokenized := m.tokenize(text)

pkg/tasks/textencoding/bert/textencoding.go

@@ -73,6 +73,12 @@ func LoadTextEncoding(modelPath string) (*TextEncoding, error) {
 	}, nil
 }
 
+// Close finalizes the TextEncoding resources.
+// It satisfies the interface io.Closer.
+func (m *TextEncoding) Close() error {
+	return m.embeddingsRepo.Close()
+}
+
 // Encode returns the dense encoded representation of the given text.
 func (m *TextEncoding) Encode(_ context.Context, text string, poolingStrategy int) (textencoding.Response, error) {
 	tokenized := m.tokenize(text)

pkg/tasks/tokenclassification/bert/tokenclassification.go

@@ -96,6 +96,12 @@ func ID2Label(value map[string]string) []string {
 	return y
 }
 
+// Close finalizes the TokenClassification resources.
+// It satisfies the interface io.Closer.
+func (m *TokenClassification) Close() error {
+	return m.embeddingsRepo.Close()
+}
+
 // Classify returns the classification of the given text.
 func (m *TokenClassification) Classify(_ context.Context, text string, parameters tokenclassification.Parameters) (tokenclassification.Response, error) {
 	tokenized := m.tokenize(text)

pkg/tasks/tokenclassification/flair/tokenclassification.go

@@ -79,6 +79,12 @@ func ID2Label(value map[string]string) []string {
 	return y
 }
 
+// Close finalizes the TokenClassification resources.
+// It satisfies the interface io.Closer.
+func (m *TokenClassification) Close() error {
+	return m.embeddingsRepo.Close()
+}
+
 // Classify returns the classification of the given text.
 func (m *TokenClassification) Classify(_ context.Context, text string, parameters tokenclassification.Parameters) (tokenclassification.Response, error) {
 	tokenized := m.tokenize(text)