Update app.py

app.py

@@ -2,6 +2,135 @@ import gradio as gr
 import torch
 import torch.nn as nn
 import sentencepiece as spm
+import math
+
+# Define Transformer components
+class MultiHeadAttention(nn.Module):
+    def __init__(self, d_model, num_heads):
+        super(MultiHeadAttention, self).__init__()
+        assert d_model % num_heads == 0
+        self.d_model = d_model
+        self.num_heads = num_heads
+        self.d_k = d_model // num_heads
+        self.W_q = nn.Linear(d_model, d_model)
+        self.W_k = nn.Linear(d_model, d_model)
+        self.W_v = nn.Linear(d_model, d_model)
+        self.W_o = nn.Linear(d_model, d_model)
+        
+    def scaled_dot_product_attention(self, Q, K, V, mask=None):
+        attn_scores = torch.matmul(Q, K.transpose(-2, -1)) / math.sqrt(self.d_k)
+        if mask is not None:
+            attn_scores = attn_scores.masked_fill(mask == 0, -1e9)
+        attn_probs = torch.softmax(attn_scores, dim=-1)
+        output = torch.matmul(attn_probs, V)
+        return output
+        
+    def split_heads(self, x):
+        batch_size, seq_length, d_model = x.size()
+        return x.view(batch_size, seq_length, self.num_heads, self.d_k).transpose(1, 2)
+        
+    def combine_heads(self, x):
+        batch_size, _, seq_length, d_k = x.size()
+        return x.transpose(1, 2).contiguous().view(batch_size, seq_length, self.d_model)
+        
+    def forward(self, Q, K, V, mask=None):
+        Q = self.split_heads(self.W_q(Q))
+        K = self.split_heads(self.W_k(K))
+        V = self.split_heads(self.W_v(V))
+        attn_output = self.scaled_dot_product_attention(Q, K, V, mask)
+        output = self.W_o(self.combine_heads(attn_output))
+        return output
+
+class PositionWiseFeedForward(nn.Module):
+    def __init__(self, d_model, d_ff):
+        super(PositionWiseFeedForward, self).__init__()
+        self.fc1 = nn.Linear(d_model, d_ff)
+        self.fc2 = nn.Linear(d_ff, d_model)
+        self.relu = nn.ReLU()
+
+    def forward(self, x):
+        return self.fc2(self.relu(self.fc1(x)))
+
+class PositionalEncoding(nn.Module):
+    def __init__(self, d_model, max_seq_length):
+        super(PositionalEncoding, self).__init__()
+        pe = torch.zeros(max_seq_length, d_model)
+        position = torch.arange(0, max_seq_length, dtype=torch.float).unsqueeze(1)
+        div_term = torch.exp(torch.arange(0, d_model, 2).float() * -(math.log(10000.0) / d_model))
+        pe[:, 0::2] = torch.sin(position * div_term)
+        pe[:, 1::2] = torch.cos(position * div_term)
+        self.register_buffer('pe', pe.unsqueeze(0))
+        
+    def forward(self, x):
+        return x + self.pe[:, :x.size(1)]
+
+class EncoderLayer(nn.Module):
+    def __init__(self, d_model, num_heads, d_ff, dropout):
+        super(EncoderLayer, self).__init__()
+        self.self_attn = MultiHeadAttention(d_model, num_heads)
+        self.feed_forward = PositionWiseFeedForward(d_model, d_ff)
+        self.norm1 = nn.LayerNorm(d_model)
+        self.norm2 = nn.LayerNorm(d_model)
+        self.dropout = nn.Dropout(dropout)
+        
+    def forward(self, x, mask):
+        attn_output = self.self_attn(x, x, x, mask)
+        x = self.norm1(x + self.dropout(attn_output))
+        ff_output = self.feed_forward(x)
+        x = self.norm2(x + self.dropout(ff_output))
+        return x
+
+class DecoderLayer(nn.Module):
+    def __init__(self, d_model, num_heads, d_ff, dropout):
+        super(DecoderLayer, self).__init__()
+        self.self_attn = MultiHeadAttention(d_model, num_heads)
+        self.cross_attn = MultiHeadAttention(d_model, num_heads)
+        self.feed_forward = PositionWiseFeedForward(d_model, d_ff)
+        self.norm1 = nn.LayerNorm(d_model)
+        self.norm2 = nn.LayerNorm(d_model)
+        self.norm3 = nn.LayerNorm(d_model)
+        self.dropout = nn.Dropout(dropout)
+        
+    def forward(self, x, enc_output, src_mask, tgt_mask):
+        attn_output = self.self_attn(x, x, x, tgt_mask)
+        x = self.norm1(x + self.dropout(attn_output))
+        attn_output = self.cross_attn(x, enc_output, enc_output, src_mask)
+        x = self.norm2(x + self.dropout(attn_output))
+        ff_output = self.feed_forward(x)
+        x = self.norm3(x + self.dropout(ff_output))
+        return x
+
+class Transformer(nn.Module):
+    def __init__(self, src_vocab_size, tgt_vocab_size, d_model, num_heads, num_layers, d_ff, max_seq_length, dropout):
+        super(Transformer, self).__init__()
+        self.encoder_embedding = nn.Embedding(src_vocab_size, d_model)
+        self.decoder_embedding = nn.Embedding(tgt_vocab_size, d_model)
+        self.positional_encoding = PositionalEncoding(d_model, max_seq_length)
+        self.encoder_layers = nn.ModuleList([EncoderLayer(d_model, num_heads, d_ff, dropout) for _ in range(num_layers)])
+        self.decoder_layers = nn.ModuleList([DecoderLayer(d_model, num_heads, d_ff, dropout) for _ in range(num_layers)])
+        self.fc = nn.Linear(d_model, tgt_vocab_size)
+        self.dropout = nn.Dropout(dropout)
+
+    def generate_mask(self, src, tgt):
+        src_mask = (src != 0).unsqueeze(1).unsqueeze(2)
+        tgt_mask = (tgt != 0).unsqueeze(1).unsqueeze(3)
+        seq_length = tgt.size(1)
+        nopeak_mask = (1 - torch.triu(torch.ones(1, seq_length, seq_length), diagonal=1)).bool()
+        tgt_mask = tgt_mask & nopeak_mask
+        return src_mask, tgt_mask
+
+    def forward(self, src, tgt):
+        src_mask, tgt_mask = self.generate_mask(src, tgt)
+        src_embedded = self.dropout(self.positional_encoding(self.encoder_embedding(src)))
+        tgt_embedded = self.dropout(self.positional_encoding(self.decoder_embedding(tgt)))
+        enc_output = src_embedded
+        for enc_layer in self.encoder_layers:
+            enc_output = enc_layer(enc_output, src_mask)
+        dec_output = tgt_embedded
+        for dec_layer in self.decoder_layers:
+            dec_output = dec_layer(dec_output, enc_output, src_mask, tgt_mask)
+        output = self.fc(dec_output)
+        return output
 
 # Set device
 device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
@@ -16,7 +145,6 @@ model = torch.load(model_path, map_location=device, weights_only=False)
 model.eval()
 model = model.to(device)
 
-
 def generate_code(pseudocode, max_len):
     """Generate C++ code from pseudocode with streaming output."""
     model.eval()
@@ -33,13 +161,12 @@ def generate_code(pseudocode, max_len):
             tgt = torch.cat([tgt, torch.tensor([[next_token]], device=device)], dim=1)
             response = sp_code.decode_ids(generated_tokens)
             yield response  # Yield partial output
-            if next_token == 5:  # <END> = 5
+            if next_token == 5:  # <END>=5
                 break
     yield response  # Final output
 
 def respond(message, history, max_tokens):
     """Wrapper for Gradio interface."""
-    # Ignore history since it's one-shot generation
     for response in generate_code(message, max_tokens):
         yield response