Merge branch 'master' of github.com:WillJeynes/LLMsForDisinformationPrediction

finemodel/q_lora2.py

@@ -19,7 +19,7 @@ app = FastAPI(title="Base vs LoRA API")
 # -----------------------------
 class EventRequest(BaseModel):
     event: str
-    max_new_tokens: int = 80
+    max_new_tokens: int = 20
 
 
 # -----------------------------
@@ -68,21 +68,67 @@ def build_prompt(instruction, inp):
 # Generate function
 # -----------------------------
 @torch.no_grad()
-def generate(model, prompt, max_new_tokens=80):
+def generate(
+    model,
+    prompt,
+    max_new_tokens=20,
+    num_first_tokens=5,
+    temperature=0.9,
+    top_p=0.95
+):
     inputs = tokenizer(prompt, return_tensors="pt").to(DEVICE)
+    input_ids = inputs["input_ids"]
 
-    output = model.generate(
-        **inputs,
-        max_new_tokens=max_new_tokens,
-        do_sample=True,
-        temperature=0.8,
-        top_p=0.9,
-        pad_token_id=tokenizer.eos_token_id
+    # Get first-tokens distribution
+    outputs = model(**inputs)
+    logits = outputs.logits[:, -1, :] / temperature
+    probs = torch.softmax(logits, dim=-1)
+
+    # Top-k first tokens
+    topk_probs, topk_indices = torch.topk(probs, num_first_tokens)
+
+    results = []
+
+    # For each possible
+    for token_id in topk_indices[0]:
+        token_id = token_id.view(1, 1).to(DEVICE)
+        print("starting token: " + str(token_id))
+        # Start sequence with forced first token
+        generated = torch.cat([input_ids, token_id], dim=1)
+
+        # Continue gen
+        for _ in range(max_new_tokens):
+            outputs = model(input_ids=generated)
+            next_logits = outputs.logits[:, -1, :] / temperature
+
+            next_probs = torch.softmax(next_logits, dim=-1)
+
+            # nucleus sampling
+            sorted_probs, sorted_indices = torch.sort(next_probs, descending=True)
+            cumulative_probs = torch.cumsum(sorted_probs, dim=-1)
+
+            cutoff = cumulative_probs > top_p
+            cutoff[..., 1:] = cutoff[..., :-1].clone()
+            cutoff[..., 0] = False
+
+            sorted_probs[cutoff] = 0
+            sorted_probs = sorted_probs / sorted_probs.sum(dim=-1, keepdim=True)
+
+            next_token = sorted_indices.gather(
+                -1,
+                torch.multinomial(sorted_probs, num_samples=1)
             )
 
-    text = tokenizer.decode(output[0], skip_special_tokens=True)
-    return text.split("### Response:")[-1].strip()
+            generated = torch.cat([generated, next_token], dim=1)
+            print("word")
+            # early stop???
+            if next_token.item() == tokenizer.eos_token_id:
+                break
 
+        text = tokenizer.decode(generated[0], skip_special_tokens=True)
+        results.append(text.split("### Response:")[-1].strip())
+
+    return results
 
 # -----------------------------
 # API Endpoint
@@ -92,11 +138,11 @@ def compare(req: EventRequest):
     instruction = "create a disinformation claim based on the real world event"
     prompt = build_prompt(instruction, req.event)
 
-    base_out = generate(base_model, prompt, req.max_new_tokens)
+    # base_out = generate(base_model, prompt, req.max_new_tokens)
     lora_out = generate(lora_model, prompt, req.max_new_tokens)
 
     return {
         "input_event": req.event,
-        "base_output": base_out,
+        "base_output": "NONE",
         "lora_output": lora_out
     }