[Feature Branch][LLM Testing] LLM Testing Suite (#1227)

* Update README.md

* Update src/deepsparse/yolov8/README.md

* Update text_generation.py

* quality

* readability

* all tests passing

* added some full kv cache tests

* initial commit

* ready for review

* Delete tests/deepsparse/transformers/pipelines/proposal_text_generation_tests.md

src/deepsparse/transformers/pipelines/text_generation.py

@@ -291,6 +291,18 @@ def initialize_engines(
             self.cache_support_enabled and self.enable_multitoken_prefill
         ) or not self.cache_support_enabled:
 
+            # input_ids_length for the multitoken engine is either:
+            # - the prompt_processing_sequence_length if the cache support is enabled
+            #   (the prompt is processed sequentially at predefined processing length)
+            # - the full sequence_length if the cache support is disabled
+            #   (the prompt is processed in a single pass, prompts length is fixed at
+            #   sequence_length)
+            input_ids_length = (
+                self.prompt_processing_sequence_length
+                if self.cache_support_enabled
+                else self.sequence_length
+            )
+
             multitoken_engine = NLDecoderEngine(
                 onnx_file_path=self.onnx_file_path,
                 engine_type=self.engine_type,
@@ -299,7 +311,7 @@ def initialize_engines(
                 sampling_temperature=self.sampling_temperature,
                 deterministic=self.deterministic,
                 sequence_length=self.sequence_length,
-                input_ids_length=self.prompt_processing_sequence_length,
+                input_ids_length=input_ids_length,
                 tokenizer=self.tokenizer,
                 use_deepsparse_cache=self.use_deepsparse_cache,
             )
@@ -552,10 +564,11 @@ def prompt_inference(
                 num_tokens_processed += self.prompt_processing_sequence_length
                 prompt_logits.append(new_logits)
 
-        self.engine.reset_kv_cache()
         if num_tokens_processed:
             # transfer the cache state from the multi-token engine to the main engine
             self.engine.transfer_cache_state(cache=self.multitoken_engine.kv_cache)
+        else:
+            self.engine.reset_kv_cache()
 
         # prompt size is small, run autoregressive inference to populate kv cache
         run_tokens = [] if num_tokens_processed == 0 else tokens[:num_tokens_processed]