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https://github.com/wassname/Castor.git
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Michael Tu
82bf90f4bb
* SST change min_freq and Kim CNN init distribution * Add tuned results for SST-1 and SST-2 * Fix typo
59 lines
2.6 KiB
Python
59 lines
2.6 KiB
Python
import torch
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import torch.nn as nn
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import torch.nn.functional as F
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class KimCNN(nn.Module):
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def __init__(self, config):
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super(KimCNN, self).__init__()
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dataset = config.dataset
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output_channel = config.output_channel
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target_class = config.target_class
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words_num = config.words_num
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words_dim = config.words_dim
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self.mode = config.mode
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Ks = 3 # There are three conv nets here
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if config.mode == 'multichannel':
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input_channel = 2
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else:
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input_channel = 1
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rand_embed_init = torch.Tensor(words_num, words_dim).uniform_(-0.25, 0.25)
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self.embed = nn.Embedding.from_pretrained(rand_embed_init, freeze=False)
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self.static_embed = nn.Embedding.from_pretrained(dataset.TEXT_FIELD.vocab.vectors, freeze=True)
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self.non_static_embed = nn.Embedding.from_pretrained(dataset.TEXT_FIELD.vocab.vectors, freeze=False)
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self.conv1 = nn.Conv2d(input_channel, output_channel, (3, words_dim), padding=(2,0))
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self.conv2 = nn.Conv2d(input_channel, output_channel, (4, words_dim), padding=(3,0))
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self.conv3 = nn.Conv2d(input_channel, output_channel, (5, words_dim), padding=(4,0))
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self.dropout = nn.Dropout(config.dropout)
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self.fc1 = nn.Linear(Ks * output_channel, target_class)
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def forward(self, x):
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x = x.text
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if self.mode == 'rand':
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word_input = self.embed(x) # (batch, sent_len, embed_dim)
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x = word_input.unsqueeze(1) # (batch, channel_input, sent_len, embed_dim)
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elif self.mode == 'static':
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static_input = self.static_embed(x)
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x = static_input.unsqueeze(1) # (batch, channel_input, sent_len, embed_dim)
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elif self.mode == 'non-static':
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non_static_input = self.non_static_embed(x)
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x = non_static_input.unsqueeze(1) # (batch, channel_input, sent_len, embed_dim)
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elif self.mode == 'multichannel':
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non_static_input = self.non_static_embed(x)
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static_input = self.static_embed(x)
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x = torch.stack([non_static_input, static_input], dim=1) # (batch, channel_input=2, sent_len, embed_dim)
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else:
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print("Unsupported Mode")
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exit()
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x = [F.relu(self.conv1(x)).squeeze(3), F.relu(self.conv2(x)).squeeze(3), F.relu(self.conv3(x)).squeeze(3)]
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# (batch, channel_output, ~=sent_len) * Ks
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x = [F.max_pool1d(i, i.size(2)).squeeze(2) for i in x] # max-over-time pooling
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# (batch, channel_output) * Ks
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x = torch.cat(x, 1) # (batch, channel_output * Ks)
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x = self.dropout(x)
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logit = self.fc1(x) # (batch, target_size)
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return logit
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