IPEX LLM serving example (#3068)

* adding the files for ipex int8 serving of llms

* Update README.md

Fixed some markdowns

* Fix handler name

* Adding default PyTorch support

* Fixing some issues with handler, added test to verify smooth-quant

* adding auto_mixed_precision flag to config

* Removing min_new_tokens from generation config

* fix lint

* lint

* lint

* Fixing unit tests with different model that doesn't require license

* Fix lint error

* Fix lint error in test

* Adding requirements.txt

* adding datasets to the requirements

* upgrading the ipex version to 2.3.0 to match that of pytorch

* Skipping ipex llm tests if accelerate is not present

---------

Co-authored-by: Ubuntu <ubuntu@ip-172-31-51-123.us-west-2.compute.internal>
Co-authored-by: lxning <23464292+lxning@users.noreply.github.com>
Co-authored-by: lxning <lninga@amazon.com>
Co-authored-by: Matthias Reso <13337103+mreso@users.noreply.github.com>

examples/large_models/ipex_llm_int8/README.md

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+# Serving IPEX Optimized Models
+This example provides an example of serving IPEX-optimized LLMs e.g. ```meta-llama/llama2-7b-hf``` on huggingface. For setting up the Python environment for this example, please refer here: https://github.com/intel/intel-extension-for-pytorch/blob/main/examples/cpu/inference/python/llm/README.md#3-environment-setup
+
+
+1. Run the model archiver
+```
+torch-model-archiver --model-name llama2-7b --version 1.0 --handler llm_handler.py --config-file llama2-7b-int8-woq-config.yaml --archive-format no-archive
+```
+
+2. Move the model inside model_store
+```
+mkdir model_store
+mv llama2-7b ./model_store
+```
+
+3. Start the torch server
+```
+torchserve --ncs --start --model-store model_store models llama2-7b
+```
+
+5. Test the model status
+```
+curl http://localhost:8081/models/llama2-7b
+```
+
+6. Send the request
+```
+curl http://localhost:8080/predictions/llama2-7b -T ./sample_text_0.txt
+```
+## Model Config
+In addition to usual torchserve configurations, you need to enable ipex specific optimization arguments.
+
+In order to enable IPEX, ```ipex_enable=true``` in the ```config.parameters``` file. If not enabled it will run with default PyTorch with ```auto_mixed_precision``` if enabled. In order to enable ```auto_mixed_precision```, you need to set ```auto_mixed_precision: true``` in model-config file.
+
+You can choose either Weight-only Quantization or Smoothquant path for quantizing the model to ```INT8```. If the ```quant_with_amp``` flag is set to ```true```, it'll use a mix of ```INT8``` and ```bfloat16``` precisions, otherwise, it'll use ```INT8``` and ```FP32``` combination. If neither approaches are enabled, the model runs on ```bfloat16``` precision by default as long as ```quant_with_amp``` or ```auto_mixed_precision``` is set to ```true```.
+
+There are 3 different example config files; ```model-config-llama2-7b-int8-sq.yaml``` for quantizing with smooth-quant,  ```model-config-llama2-7b-int8-woq.yaml``` for quantizing with weight only quantization, and  ```model-config-llama2-7b-bf16.yaml``` for running the text generation on bfloat16 precision.
+
+### IPEX Weight Only Quantization
+<ul>
+    <li> weight_type: weight data type for weight only quantization. Options: INT8 or INT4.  
+    <li> lowp_mode: low precision mode for weight only quantization. It indicates data type for computation.
+</ul>
+
+### IPEX Smooth Quantization
+
+<ul>
+    <li> calibration_dataset, and calibration split: dataset and split to be used for calibrating the model quantization
+    <li> num_calibration_iters: number of calibration iterations
+    <li> alpha: a floating point number between 0.0 and 1.0. For more complex smoothquant config, explore IPEX quantization recipes ( https://github.com/intel/intel-extension-for-pytorch/blob/main/examples/cpu/inference/python/llm/single_instance/run_quantization.py )
+</ul>
+
+Set ```greedy``` to true if you want to perform greedy search decoding. If set false, beam search of size 4 is performed by default.

examples/large_models/ipex_llm_int8/config.properties

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+ipex_enable=true
+cpu_launcher_enable=true
+cpu_launcher_args=--node_id 0