Merge branch 'setsumbt_bug' into 'github_master'

Fix SetSUMBT bug resulting from new torch feature

See merge request dsml/convlab/ConvLab3!59

convlab/dst/setsumbt/modeling/setsumbt.py

@@ -57,7 +57,7 @@ class SlotUtteranceMatching(Module):
         turn_embeddings = turn_embeddings.transpose(0, 1)
 
         key_padding_mask = (attention_mask[:, :, 0] == 0.0)
-        key_padding_mask[key_padding_mask[:, 0], :] = False
+        key_padding_mask[torch.clone(key_padding_mask)[:, 0], :] = False
 
         hidden, _ = self.attention(query=slot_embeddings, key=turn_embeddings, value=turn_embeddings,
                                    key_padding_mask=key_padding_mask)

convlab/dst/setsumbt/tracker.py

@@ -346,17 +346,26 @@ class SetSUMBTTracker(DST):
             state_entropy = None
 
         # Construct request action prediction
+        if request_probs is not None:
             request_acts = [slot for slot, p in request_probs.items() if p[0, 0].item() > 0.5]
             request_acts = [slot.split('-', 1) for slot in request_acts]
             request_acts = [['request', domain, slot, '?'] for domain, slot in request_acts]
+        else:
+            request_acts = list()
 
         # Construct active domain set
+        if active_domain_probs is not None:
             active_domains = {domain: p[0, 0].item() > 0.5 for domain, p in active_domain_probs.items()}
+        else:
+            active_domains = dict()
 
         # Construct general domain action
+        if general_act_probs is not None:
             general_acts = general_act_probs[0, 0, :].argmax(-1).item()
             general_acts = [[], ['bye'], ['thank']][general_acts]
             general_acts = [[act, 'general', 'none', 'none'] for act in general_acts]
+        else:
+            general_acts = list()
 
         user_acts = request_acts + general_acts