Fix pipeline parallel inference past_key_value error in Baichuan (#11318)

* fix past_key_value error

* add baichuan2 example

* fix style

* update doc

* add script link in doc

* fix import error

* update

python/llm/example/GPU/Pipeline-Parallel-Inference/README.md

@@ -11,6 +11,8 @@ To run this example with IPEX-LLM on Intel GPUs, we have some recommended requir
 - [meta-llama/Meta-Llama-3-8B-Instruct](./run_llama_arc_2_card.sh)
 - [Qwen/Qwen1.5-7B-Chat](./run_qwen1.5_arc_2_card.sh)
 - [Qwen/Qwen1.5-14B-Chat](./run_qwen1.5_arc_2_card.sh)
+- [baichuan-inc/Baichuan2-7B-Chat](./run_baichuan2_arc_2_card.sh)
+- [baichuan-inc/Baichuan2-13B-Chat](./run_baichuan2_arc_2_card.sh)
 
 ## Example: Run pipeline parallel inference on multiple GPUs
 
@@ -63,6 +65,22 @@ bash run_qwen1.5_arc_2_card.sh
 
 </details>
 
+</details>
+
+<details>
+  <summary> Show Baichuan2 example </summary>
+
+#### Run Baichuan2-7B-Chat / Baichuan2-13B-Chat on two Intel Arc A770
+
+You could specify `--repo-id-or-model-path` in the test script to be the huggingface repo id for Baichuan2 to be downloaded, or the path to the huggingface checkpoint folder. Besides, you could change `NUM_GPUS` to the number of GPUs you have on your machine.
+
+```bash
+pip install transformers==4.37.0
+bash run_baichuan2_arc_2_card.sh
+```
+
+</details>
+
 ### 3. Sample Output
 #### [meta-llama/Llama-2-13b-chat-hf](https://huggingface.co/meta-llama/Llama-2-13b-chat-hf)
 ```log

python/llm/example/GPU/Pipeline-Parallel-Inference/run_baichuan2_arc_2_card.sh

@@ -0,0 +1,36 @@
+#
+# Copyright 2016 The BigDL Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+source /opt/intel/oneapi/setvars.sh
+export MASTER_ADDR=127.0.0.1
+export MASTER_PORT=9090
+export FI_PROVIDER=tcp
+export USE_XETLA=OFF
+export OMP_NUM_THREADS=6
+if [[ $KERNEL_VERSION != *"6.5"* ]]; then
+    export SYCL_PI_LEVEL_ZERO_USE_IMMEDIATE_COMMANDLISTS=1
+fi
+export TORCH_LLM_ALLREDUCE=0
+
+NUM_GPUS=2 # number of used GPU
+
+# To run Baichuan2-7B-Chat
+CCL_ZE_IPC_EXCHANGE=sockets torchrun --standalone --nnodes=1 --nproc-per-node $NUM_GPUS \
+    generate.py --repo-id-or-model-path 'baichuan-inc/Baichuan2-7B-Chat' --gpu-num $NUM_GPUS
+
+# # To run Baichuan2-13B-Chat
+# CCL_ZE_IPC_EXCHANGE=sockets torchrun --standalone --nnodes=1 --nproc-per-node $NUM_GPUS \
+#     generate.py --repo-id-or-model-path 'baichuan-inc/Baichuan2-13B-Chat' --gpu-num $NUM_GPUS

python/llm/example/GPU/Pipeline-Parallel-Inference/run_llama_arc_2_card.sh

@@ -20,6 +20,7 @@ export MASTER_PORT=9090
 export FI_PROVIDER=tcp
 export USE_XETLA=OFF
 export OMP_NUM_THREADS=6
+export IPEX_LLM_QUANTIZE_KV_CACHE=1
 if [[ $KERNEL_VERSION != *"6.5"* ]]; then
     export SYCL_PI_LEVEL_ZERO_USE_IMMEDIATE_COMMANDLISTS=1
 fi

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

@@ -79,6 +79,9 @@ def pipeline_parallel(model, pipeline_parallel_stages):
         pipeline_parallel_stages
 
     local_rank = dist.get_rank()
+
+    global layer_start
+    global layer_end
     layer_start = slice_size * local_rank
     layer_end = layer_start + min(slice_size, model.config.num_hidden_layers - layer_start)
 
@@ -144,6 +147,9 @@ def pipeline_parallel_generate(self,
     pre_rank = (local_rank - 1) % self.pipeline_parallel_stages
     next_rank = (local_rank + 1) % self.pipeline_parallel_stages
 
+    global layer_start
+    global layer_end
+
     self.first_token_time = 0
     self.next_token_time = []
 
@@ -182,7 +188,16 @@ def pipeline_parallel_generate(self,
 
         _input_ids = next_ids
         output_ids = torch.cat([output_ids, next_ids], dim=-1)
+
+        if isinstance(outputs.past_key_values, tuple) and local_rank != 0:
+            value_placeholder = torch.empty_like((outputs.past_key_values)[-1][0])
+            past_key_values_placeholder = tuple(
+                (value_placeholder, value_placeholder) for _ in range(layer_start)
+            ) + (outputs.past_key_values)[layer_start:]
+            _past_key_values = past_key_values_placeholder
+        else:
             _past_key_values = outputs.past_key_values
+
         toc = time.time()
         if step == 0:
             self.first_token_time = toc - tic