add rnn nlg

Author: chongjiu.jin

rnn-poetry/model.py

@@ -0,0 +1,58 @@
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+batch_size=128
+embed_size=128
+hidden_dims=256
+
+def generate_poetry(model,word2ix,ix2word,device,begin,sent_len=4):
+    start_idx=[word2ix['[']]
+    end_word=''
+    lens=0
+    hidden = None
+    ret=''
+    data_ = torch.tensor([start_idx], device=device).long()
+    output, hidden = model(data_, hidden)
+    start_idx=[word2ix[begin]]
+    ret+=begin
+    while end_word!=']' and len(ret)<100:
+        data_ = torch.tensor([start_idx],device=device).long()
+        # print("data size",data_.size())
+        output, hidden = model(data_, hidden)
+        # print("output size", output.size())
+        ouput_idx=output.view(-1).argmax().cpu()
+        # print('ouput_idx',ouput_idx)
+        # print('ouput_idx', ouput_idx.item())
+        ouput_idx=ouput_idx.item()
+        start_idx=[ouput_idx]
+        end_word=ix2word[ouput_idx]
+        ret+=end_word
+    return ret
+
+class RNNModel(nn.Module):
+    def __init__(self, vocab_size, embedding_dim, hidden_dim):
+        super(RNNModel, self).__init__()
+        self.hidden_dim = hidden_dim
+        self.embeddings = nn.Embedding(vocab_size, embedding_dim)
+        self.lstm = nn.LSTM(embedding_dim, self.hidden_dim, num_layers=2)
+        self.linear1 = nn.Linear(self.hidden_dim, vocab_size)
+
+
+
+    def forward(self, x, hidden=None):
+        seq_len, batch_size = x.size()
+
+
+        # size: (seq_len,batch_size,embeding_dim)
+        embeds = self.embeddings(x)
+        # output size: (seq_len,batch_size,hidden_dim)
+        if hidden is None:
+            output, hidden = self.lstm(embeds)
+        else:
+            h_0, c_0 = hidden
+            output, hidden = self.lstm(embeds, (h_0, c_0))
+
+        # size: (seq_len*batch_size,vocab_size)
+        output = self.linear1(output.view(seq_len * batch_size, -1))
+        return output, hidden