Support streaming for lookup generation (#11922)

* Support streaming for lookup generation

* Small update

* Style fixes

* Add origin generate full back for batch inference and beam search; support input length threshold judgement for directly input with input_ids

* Fix lookup stream generate with eos token

* Small fixes

* Small fix

* index fix

* Small fix

python/llm/src/ipex_llm/transformers/lookup.py

@@ -59,23 +59,40 @@ def generate(
 ):
     lookahead = kwargs.pop("lookahead", None)
     perf_mode = os.environ.get("IPEX_LLM_PERFORMANCE_MODE", None)
-    if perf_mode == "1" and lookahead is None:
-        if inputs is not None:
-            if inputs.shape[1] >= PERFORMANCE_MODE_LOOKUP_INPUT_THRESHOLD:
-                lookahead = 2  # default to 2 now
+
+    input_ids_shape = None
+    if inputs is not None:
+        input_ids_shape = inputs.shape
+    else:
+        input_ids = kwargs.get("input_ids", None)
+        if input_ids is not None:
+            input_ids_shape = input_ids.shape
         else:
             inputs_embeds = kwargs.get("inputs_embeds", None)
             if inputs_embeds is not None:
-                if inputs_embeds.shape[1] >= PERFORMANCE_MODE_LOOKUP_INPUT_THRESHOLD:
-                    lookahead = 2  # default to 2 now
+                input_ids_shape = inputs_embeds.shape
+
+    if perf_mode == "1" and lookahead is None:
+        if input_ids_shape is not None and \
+                input_ids_shape[1] >= PERFORMANCE_MODE_LOOKUP_INPUT_THRESHOLD:
+            lookahead = 2  # default to 2 now
+
     if lookahead:
         from ipex_llm.transformers.convert import get_enable_ipex
         _enable_ipex = get_enable_ipex()
 
         if self.device.type == "cpu" and _enable_ipex:
             logger.warning("Prompt lookup is currently not supported on CPU with IPEX, "
                            "fallback to original generate.")
-            kwargs.pop("max_matching_ngram_size")
+            kwargs.pop("max_matching_ngram_size", None)
+        elif input_ids_shape is not None and input_ids_shape[0] > 1:
+            logger.warning("Prompt lookup is currently not supported with batch inference, "
+                           "fallback to original generate.")
+            kwargs.pop("max_matching_ngram_size", None)
+        elif kwargs.get("num_beams", None) not in [None, 1]:
+            logger.warning("Prompt lookup is currently not supported with num_beams != 1, "
+                           "fallback to original generate.")
+            kwargs.pop("max_matching_ngram_size", None)
         else:
             # Do prompt lookup generation
             # If lookahead is provided, we will use lookup_generate instead of
@@ -94,6 +111,7 @@ def generate(
             return self.lookup_generate(inputs=inputs,
                                         num_output_tokens=lookahead,
                                         generation_config=generation_config,
+                                        streamer=streamer,
                                         logits_processor=logits_processor,
                                         stopping_criteria=stopping_criteria,
                                         prefix_allowed_tokens_fn=prefix_allowed_tokens_fn,
@@ -254,12 +272,19 @@ def lookup_generate(self,
                     num_output_tokens: int = 10,
                     max_matching_ngram_size: int = None,
                     generation_config: Optional[GenerationConfig] = None,
+                    streamer: Optional["BaseStreamer"] = None,
                     attention_mask=None,
                     **sampling_kwargs):
     input_ids, generation_config, logits_processor, stopping_criteria, \
         model_kwargs = _prepare_generate_args(self, inputs, generation_config,
                                               **sampling_kwargs)
 
+    invalidInputError(input_ids.shape[0] == 1,
+                      "Prompt lookup is currently not supported with batch inference.")
+
+    if streamer is not None:
+        streamer.put(input_ids.cpu())
+
     device_name = get_xpu_device_type(input_ids)
 
     candidates_generator = PromptLookupCandidateGenerator(
@@ -406,12 +431,19 @@ def lookup_generate(self,
                     first_eos_idx = out_idx
                     break
             if first_eos_idx > -1:
+                if streamer is not None:
+                    streamer.put(output_ids[:(first_eos_idx + 1)].cpu())
                 step -= (len(output_ids_list) - first_eos_idx - 1)
                 break
+        if streamer is not None:
+            streamer.put(output_ids.cpu())
 
     step = min(step, max_new_tokens)
     e2e_toc = time.time()
     self.n_token_generated = step
     self.e2e_time_without_first = e2e_toc - e2e_tic
 
+    if streamer is not None:
+        streamer.end()
+
     return input_ids[:, : input_len + step]