increase NS size (10X) + choose K most scored for NS

models.py

@@ -100,7 +100,10 @@ class MetaTL(nn.Module):
 
             y = torch.Tensor([1]).to(self.device)
             self.zero_grad()
-            loss = self.loss_func(p_score, n_score, y)
+
+            sorted,indecies = torch.sort(n_score, descending=True,dim=1)
+            n_values = sorted[:,0:p_score.shape[1]]
+            loss = self.loss_func(p_score, n_values, y)
             loss.backward(retain_graph=True)
 
             grad_meta = rel.grad

sampler.py

@@ -31,7 +31,7 @@ def sample_function_mixed(user_train, usernum, itemnum, batch_size, maxlen, resu
             
             seq = np.zeros([maxlen], dtype=np.int32)
             pos = np.zeros([maxlen], dtype=np.int32)
-            neg = np.zeros([maxlen], dtype=np.int32)
+            neg = np.zeros([maxlen*10], dtype=np.int32)
 
             if len(user_train[user]) < maxlen:
                 nxt_idx = len(user_train[user]) - 1
@@ -45,20 +45,24 @@ def sample_function_mixed(user_train, usernum, itemnum, batch_size, maxlen, resu
             for i in reversed(user_train[user][min(0, nxt_idx - 1 - maxlen) : nxt_idx - 1]):
                 seq[idx] = i
                 pos[idx] = nxt
-                if nxt != 0: neg[idx] = random_neq(1, itemnum + 1, ts, user_train,usernum)
+                # if nxt != 0: neg[idx] = random_neq(1, itemnum + 1, ts, user_train,usernum)
                 nxt = i
                 idx -= 1
                 if idx == -1: break
 
-            # for i in range(len(neg)):
-            #     neg[i] = random_neq(1, itemnum + 1, ts, user_train,usernum)
+            for i in range(len(neg)):
+                neg[i] = random_neq(1, itemnum + 1, ts, user_train,usernum)
 
             curr_rel = user
             support_triples, support_negative_triples, query_triples, negative_triples = [], [], [], []
             for idx in range(maxlen-1):
                 support_triples.append([seq[idx],curr_rel,pos[idx]])
                 # support_negative_triples.append([seq[idx],curr_rel,neg[idx]])
+                # support_negative_triples.append([seq[-1], curr_rel, neg[idx]])
+
+            for idx in range(maxlen*10 - 1):
                 support_negative_triples.append([seq[-1], curr_rel, neg[idx]])
+
             query_triples.append([seq[-1],curr_rel,pos[-1]])
             negative_triples.append([seq[-1],curr_rel,neg[-1]])
 

utils.py

@@ -118,7 +118,7 @@ class DataLoader(object):
         
         seq = np.zeros([self.maxlen], dtype=np.int32)
         pos = np.zeros([self.maxlen - 1], dtype=np.int32)
-        neg = np.zeros([self.maxlen - 1], dtype=np.int32)
+        neg = np.zeros([self.maxlen*10 - 1], dtype=np.int32)
         
         idx = self.maxlen - 1
 
@@ -127,15 +127,21 @@ class DataLoader(object):
             seq[idx] = i
             if idx > 0:
                 pos[idx - 1] = i
-                if i != 0: neg[idx - 1] = random_neq(1, self.itemnum + 1, ts,self.train)
+                # if i != 0: neg[idx - 1] = random_neq(1, self.itemnum + 1, ts,self.train)
             idx -= 1
             if idx == -1: break
 
+        for i in range(len(neg)):
+            neg[i] = random_neq(1, self.itemnum + 1, ts,self.train)
+
         curr_rel = u
         support_triples, support_negative_triples, query_triples, negative_triples = [], [], [], []
         for idx in range(self.maxlen-1):
             support_triples.append([seq[idx],curr_rel,pos[idx]])
             # support_negative_triples.append([seq[idx],curr_rel,neg[idx]])
+            # support_negative_triples.append([seq[-1],curr_rel,neg[idx]])
+
+        for idx in range(len(neg)):
             support_negative_triples.append([seq[-1],curr_rel,neg[idx]])
 
         rated = ts