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englishTOspanish.pt

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+version https://git-lfs.github.com/spec/v1
+oid sha256:21fc375bda44d14de08b0859f23ceb00ef36c6f2ca46846834582281d9c47f06
+size 30598354

transformer.py

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+import numpy as np
+import torch
+import math
+from torch import nn
+import torch.nn.functional as F
+
+def get_device():
+    return torch.device('cuda') if torch.cuda.is_available() else torch.device('cpu')
+
+def scaled_dot_product(q, k, v, mask=None):
+    d_k = q.size()[-1]
+    scaled = torch.matmul(q, k.transpose(-1, -2)) / math.sqrt(d_k)
+    if mask is not None:
+        scaled = scaled.permute(1, 0, 2, 3) + mask
+        scaled = scaled.permute(1, 0, 2, 3)
+    attention = F.softmax(scaled, dim=-1)
+    values = torch.matmul(attention, v)
+    return values, attention
+
+class PositionalEncoding(nn.Module):
+    def __init__(self, d_model, max_sequence_length):
+        super().__init__()
+        self.max_sequence_length = max_sequence_length
+        self.d_model = d_model
+
+    def forward(self):
+        even_i = torch.arange(0, self.d_model, 2).float()
+        denominator = torch.pow(10000, even_i/self.d_model)
+        position = (torch.arange(self.max_sequence_length)
+                          .reshape(self.max_sequence_length, 1))
+        even_PE = torch.sin(position / denominator)
+        odd_PE = torch.cos(position / denominator)
+        stacked = torch.stack([even_PE, odd_PE], dim=2)
+        PE = torch.flatten(stacked, start_dim=1, end_dim=2)
+        return PE
+
+class SentenceEmbedding(nn.Module):
+    def __init__(self, max_sequence_length, d_model, language_to_index, START_TOKEN, END_TOKEN, PADDING_TOKEN):
+        super().__init__()
+        self.vocab_size = len(language_to_index)
+        self.max_sequence_length = max_sequence_length
+        self.embedding = nn.Embedding(self.vocab_size, d_model)
+        self.language_to_index = language_to_index
+        self.position_encoder = PositionalEncoding(d_model, max_sequence_length)
+        self.dropout = nn.Dropout(p=0.1)
+        self.START_TOKEN = START_TOKEN
+        self.END_TOKEN = END_TOKEN
+        self.PADDING_TOKEN = PADDING_TOKEN
+    
+    def batch_tokenize(self, batch, start_token, end_token):
+
+        def tokenize(sentence, start_token, end_token):
+            sentence_word_indicies = [self.language_to_index[token] for token in list(sentence)]
+            if start_token:
+                sentence_word_indicies.insert(0, self.language_to_index[self.START_TOKEN])
+            if end_token:
+                sentence_word_indicies.append(self.language_to_index[self.END_TOKEN])
+            for _ in range(len(sentence_word_indicies), self.max_sequence_length):
+                sentence_word_indicies.append(self.language_to_index[self.PADDING_TOKEN])
+            return torch.tensor(sentence_word_indicies)
+
+        tokenized = []
+        for sentence_num in range(len(batch)):
+           tokenized.append( tokenize(batch[sentence_num], start_token, end_token) )
+        tokenized = torch.stack(tokenized)
+        return tokenized.to(get_device())
+    
+    def forward(self, x, start_token, end_token):
+        x = self.batch_tokenize(x, start_token, end_token)
+        x = self.embedding(x)
+        pos = self.position_encoder().to(get_device())
+        x = self.dropout(x + pos)
+        return x
+
+
+class MultiHeadAttention(nn.Module):
+    def __init__(self, d_model, num_heads):
+        super().__init__()
+        self.d_model = d_model
+        self.num_heads = num_heads
+        self.head_dim = d_model // num_heads
+        self.qkv_layer = nn.Linear(d_model , 3 * d_model)
+        self.linear_layer = nn.Linear(d_model, d_model)
+    
+    def forward(self, x, mask):
+        batch_size, sequence_length, d_model = x.size()
+        qkv = self.qkv_layer(x)
+        qkv = qkv.reshape(batch_size, sequence_length, self.num_heads, 3 * self.head_dim)
+        qkv = qkv.permute(0, 2, 1, 3)
+        q, k, v = qkv.chunk(3, dim=-1)
+        values, attention = scaled_dot_product(q, k, v, mask)
+        values = values.permute(0, 2, 1, 3).reshape(batch_size, sequence_length, self.num_heads * self.head_dim)
+        out = self.linear_layer(values)
+        return out
+
+
+class LayerNormalization(nn.Module):
+    def __init__(self, parameters_shape, eps=1e-5):
+        super().__init__()
+        self.parameters_shape=parameters_shape
+        self.eps=eps
+        self.gamma = nn.Parameter(torch.ones(parameters_shape))
+        self.beta =  nn.Parameter(torch.zeros(parameters_shape))
+
+    def forward(self, inputs):
+        dims = [-(i + 1) for i in range(len(self.parameters_shape))]
+        mean = inputs.mean(dim=dims, keepdim=True)
+        var = ((inputs - mean) ** 2).mean(dim=dims, keepdim=True)
+        std = (var + self.eps).sqrt()
+        y = (inputs - mean) / std
+        out = self.gamma * y + self.beta
+        return out
+
+  
+class PositionwiseFeedForward(nn.Module):
+    def __init__(self, d_model, hidden, drop_prob=0.1):
+        super(PositionwiseFeedForward, self).__init__()
+        self.linear1 = nn.Linear(d_model, hidden)
+        self.linear2 = nn.Linear(hidden, d_model)
+        self.relu = nn.ReLU()
+        self.dropout = nn.Dropout(p=drop_prob)
+
+    def forward(self, x):
+        x = self.linear1(x)
+        x = self.relu(x)
+        x = self.dropout(x)
+        x = self.linear2(x)
+        return x
+
+
+class EncoderLayer(nn.Module):
+    def __init__(self, d_model, ffn_hidden, num_heads, drop_prob):
+        super(EncoderLayer, self).__init__()
+        self.attention = MultiHeadAttention(d_model=d_model, num_heads=num_heads)
+        self.norm1 = LayerNormalization(parameters_shape=[d_model])
+        self.dropout1 = nn.Dropout(p=drop_prob)
+        self.ffn = PositionwiseFeedForward(d_model=d_model, hidden=ffn_hidden, drop_prob=drop_prob)
+        self.norm2 = LayerNormalization(parameters_shape=[d_model])
+        self.dropout2 = nn.Dropout(p=drop_prob)
+
+    def forward(self, x, self_attention_mask):
+        residual_x = x.clone()
+        x = self.attention(x, mask=self_attention_mask)
+        x = self.dropout1(x)
+        x = self.norm1(x + residual_x)
+        residual_x = x.clone()
+        x = self.ffn(x)
+        x = self.dropout2(x)
+        x = self.norm2(x + residual_x)
+        return x
+    
+class SequentialEncoder(nn.Sequential):
+    def forward(self, *inputs):
+        x, self_attention_mask  = inputs
+        for module in self._modules.values():
+            x = module(x, self_attention_mask)
+        return x
+
+class Encoder(nn.Module):
+    def __init__(self, 
+                 d_model, 
+                 ffn_hidden, 
+                 num_heads, 
+                 drop_prob, 
+                 num_layers,
+                 max_sequence_length,
+                 language_to_index,
+                 START_TOKEN,
+                 END_TOKEN, 
+                 PADDING_TOKEN):
+        super().__init__()
+        self.sentence_embedding = SentenceEmbedding(max_sequence_length, d_model, language_to_index, START_TOKEN, END_TOKEN, PADDING_TOKEN)
+        self.layers = SequentialEncoder(*[EncoderLayer(d_model, ffn_hidden, num_heads, drop_prob)
+                                      for _ in range(num_layers)])
+
+    def forward(self, x, self_attention_mask, start_token, end_token):
+        x = self.sentence_embedding(x, start_token, end_token)
+        x = self.layers(x, self_attention_mask)
+        return x
+
+
+class MultiHeadCrossAttention(nn.Module):
+    def __init__(self, d_model, num_heads):
+        super().__init__()
+        self.d_model = d_model
+        self.num_heads = num_heads
+        self.head_dim = d_model // num_heads
+        self.kv_layer = nn.Linear(d_model , 2 * d_model)
+        self.q_layer = nn.Linear(d_model , d_model)
+        self.linear_layer = nn.Linear(d_model, d_model)
+    
+    def forward(self, x, y, mask):
+        batch_size, sequence_length, d_model = x.size()
+        kv = self.kv_layer(x)
+        q = self.q_layer(y)
+        kv = kv.reshape(batch_size, sequence_length, self.num_heads, 2 * self.head_dim)
+        q = q.reshape(batch_size, sequence_length, self.num_heads, self.head_dim)
+        kv = kv.permute(0, 2, 1, 3)
+        q = q.permute(0, 2, 1, 3)
+        k, v = kv.chunk(2, dim=-1)
+        values, attention = scaled_dot_product(q, k, v, mask)
+        values = values.permute(0, 2, 1, 3).reshape(batch_size, sequence_length, d_model)
+        out = self.linear_layer(values)
+        return out
+
+
+class DecoderLayer(nn.Module):
+    def __init__(self, d_model, ffn_hidden, num_heads, drop_prob):
+        super(DecoderLayer, self).__init__()
+        self.self_attention = MultiHeadAttention(d_model=d_model, num_heads=num_heads)
+        self.layer_norm1 = LayerNormalization(parameters_shape=[d_model])
+        self.dropout1 = nn.Dropout(p=drop_prob)
+
+        self.encoder_decoder_attention = MultiHeadCrossAttention(d_model=d_model, num_heads=num_heads)
+        self.layer_norm2 = LayerNormalization(parameters_shape=[d_model])
+        self.dropout2 = nn.Dropout(p=drop_prob)
+
+        self.ffn = PositionwiseFeedForward(d_model=d_model, hidden=ffn_hidden, drop_prob=drop_prob)
+        self.layer_norm3 = LayerNormalization(parameters_shape=[d_model])
+        self.dropout3 = nn.Dropout(p=drop_prob)
+
+    def forward(self, x, y, self_attention_mask, cross_attention_mask):
+        _y = y.clone()
+        y = self.self_attention(y, mask=self_attention_mask)
+        y = self.dropout1(y)
+        y = self.layer_norm1(y + _y)
+
+        _y = y.clone()
+        y = self.encoder_decoder_attention(x, y, mask=cross_attention_mask)
+        y = self.dropout2(y)
+        y = self.layer_norm2(y + _y)
+
+        _y = y.clone()
+        y = self.ffn(y)
+        y = self.dropout3(y)
+        y = self.layer_norm3(y + _y)
+        return y
+
+
+class SequentialDecoder(nn.Sequential):
+    def forward(self, *inputs):
+        x, y, self_attention_mask, cross_attention_mask = inputs
+        for module in self._modules.values():
+            y = module(x, y, self_attention_mask, cross_attention_mask)
+        return y
+
+class Decoder(nn.Module):
+    def __init__(self, 
+                 d_model, 
+                 ffn_hidden, 
+                 num_heads, 
+                 drop_prob, 
+                 num_layers,
+                 max_sequence_length,
+                 language_to_index,
+                 START_TOKEN,
+                 END_TOKEN, 
+                 PADDING_TOKEN):
+        super().__init__()
+        self.sentence_embedding = SentenceEmbedding(max_sequence_length, d_model, language_to_index, START_TOKEN, END_TOKEN, PADDING_TOKEN)
+        self.layers = SequentialDecoder(*[DecoderLayer(d_model, ffn_hidden, num_heads, drop_prob) for _ in range(num_layers)])
+
+    def forward(self, x, y, self_attention_mask, cross_attention_mask, start_token, end_token):
+        y = self.sentence_embedding(y, start_token, end_token)
+        y = self.layers(x, y, self_attention_mask, cross_attention_mask)
+        return y
+
+
+class Transformer(nn.Module):
+    def __init__(self, 
+                d_model, 
+                ffn_hidden, 
+                num_heads, 
+                drop_prob, 
+                num_layers,
+                max_sequence_length, 
+                kn_vocab_size,
+                english_to_index,
+                kannada_to_index,
+                START_TOKEN, 
+                END_TOKEN, 
+                PADDING_TOKEN
+                ):
+        super().__init__()
+        self.encoder = Encoder(d_model, ffn_hidden, num_heads, drop_prob, num_layers, max_sequence_length, english_to_index, START_TOKEN, END_TOKEN, PADDING_TOKEN)
+        self.decoder = Decoder(d_model, ffn_hidden, num_heads, drop_prob, num_layers, max_sequence_length, kannada_to_index, START_TOKEN, END_TOKEN, PADDING_TOKEN)
+        self.linear = nn.Linear(d_model, kn_vocab_size)
+        self.device = torch.device('cuda') if torch.cuda.is_available() else torch.device('cpu')
+
+    def forward(self, 
+                x, 
+                y, 
+                encoder_self_attention_mask=None, 
+                decoder_self_attention_mask=None, 
+                decoder_cross_attention_mask=None,
+                enc_start_token=False,
+                enc_end_token=False,
+                dec_start_token=False,
+                dec_end_token=False):
+        x = self.encoder(x, encoder_self_attention_mask, start_token=enc_start_token, end_token=enc_end_token)
+        out = self.decoder(x, y, decoder_self_attention_mask, decoder_cross_attention_mask, start_token=dec_start_token, end_token=dec_end_token)
+        out = self.linear(out)
+        return out