AC: fix swutch to sync in context window case (#3302)

Author: eaidova

tools/accuracy_checker/openvino/tools/accuracy_checker/adapters/regression.py

@@ -130,8 +130,9 @@ def process(self, raw, identifiers, frame_meta):
         Returns:
             list of RegressionPrediction objects
         """
+
+        self.select_output_blob(raw)
         predictions = self._extract_predictions(raw, frame_meta)
-        self.select_output_blob(predictions)
         predictions = predictions[self.output_blob]
 
         result = []
@@ -166,4 +167,4 @@ def select_output_blob(self, outputs):
         if self.target_out:
             self.output_blob = self.check_output_name(self.target_out, outputs)
         if self.output_blob is None:
-            self.output_blob = next(iter(outputs))
+            self.output_blob = next(iter(outputs)) if not isinstance(outputs, list) else next(iter(outputs[0]))

tools/accuracy_checker/openvino/tools/accuracy_checker/metrics/question_answering.py

@@ -180,4 +180,4 @@ def evaluate(self, annotations, predictions):
             if c_pos_index in index[:self.top_k]:
                 true_pos += 1
 
-        return [true_pos/len(q_pairs)]
+        return [true_pos/len(q_pairs)] if q_pairs else 0

tools/accuracy_checker/openvino/tools/accuracy_checker/preprocessor/preprocessing_executor.py

@@ -55,7 +55,7 @@ def __init__(
             preprocessor = Preprocessor.provide(
                 processor[identifier], config=processor, name=type_
             )
-            if processor[identifier] in MULTI_INFER_PREPROCESSORS:
+            if processor[identifier] in MULTI_INFER_PREPROCESSORS or getattr(preprocessor, 'to_multi_infer', False):
                 self._multi_infer_transformations = True
 
             self.processors.append(preprocessor)