Fixed minor bug when running training on cuda

examples/run_pplm_discrim_train.py

@@ -18,6 +18,7 @@ import torch.utils.data as data
 from nltk.tokenize.treebank import TreebankWordDetokenizer
 from torchtext import data as torchtext_data
 from torchtext import datasets
+
 from transformers import GPT2Tokenizer, GPT2LMHeadModel
 
 torch.manual_seed(0)
@@ -89,7 +90,7 @@ class Discriminator(torch.nn.Module):
         if self.cached_mode:
             avg_hidden = x.to(device)
         else:
-            avg_hidden = self.avg_representation(x)
+            avg_hidden = self.avg_representation(x.to(device))
 
         logits = self.classifier_head(avg_hidden)
         probs = F.log_softmax(logits, dim=-1)
@@ -203,7 +204,7 @@ def evaluate_performance(data_loader, discriminator):
 
 def predict(input_sentence, model, classes, cached=False):
     input_t = model.tokenizer.encode(input_sentence)
-    input_t = torch.tensor([input_t], dtype=torch.long)
+    input_t = torch.tensor([input_t], dtype=torch.long, device=device)
     if cached:
         input_t = model.avg_representation(input_t)
 
@@ -428,7 +429,8 @@ def train_discriminator(
         with open(dataset_fp) as f:
             csv_reader = csv.reader(f, delimiter='\t')
             for row in csv_reader:
-                classes.add(row[0])
+                if row:
+                    classes.add(row[0])
 
         idx2class = sorted(classes)
         class2idx = {c: i for i, c in enumerate(idx2class)}
@@ -444,30 +446,31 @@ def train_discriminator(
         with open(dataset_fp) as f:
             csv_reader = csv.reader(f, delimiter='\t')
             for i, row in enumerate(csv_reader):
-                label = row[0]
-                text = row[1]
-
-                try:
-                    seq = discriminator.tokenizer.encode(text)
-                    if (len(seq) < max_length_seq):
-                        seq = torch.tensor(
-                            [50256] + seq,
-                            device=device,
-                            dtype=torch.long
-                        )
-
-                    else:
-                        print("Line {} is longer than maximum length {}".format(
-                            i, max_length_seq
-                        ))
-                        continue
-
-                    x.append(seq)
-                    y.append(class2idx[label])
-
-                except:
-                    print("Error tokenizing line {}, skipping it".format(i))
-                    pass
+                if row:
+                    label = row[0]
+                    text = row[1]
+
+                    try:
+                        seq = discriminator.tokenizer.encode(text)
+                        if (len(seq) < max_length_seq):
+                            seq = torch.tensor(
+                                [50256] + seq,
+                                device=device,
+                                dtype=torch.long
+                            )
+
+                        else:
+                            print("Line {} is longer than maximum length {}".format(
+                                i, max_length_seq
+                            ))
+                            continue
+
+                        x.append(seq)
+                        y.append(class2idx[label])
+
+                    except:
+                        print("Error tokenizing line {}, skipping it".format(i))
+                        pass
 
         full_dataset = Dataset(x, y)
         train_size = int(0.9 * len(full_dataset))