mpt

MPT

This document explains how to build the MPT model using TensorRT-LLM and run on a single GPU and a single node with multiple GPUs

Overview

Currently we use tensorrt_llm.models.GPTLMHeadModel to build TRT engine for MPT models. Support for float16, float32 and bfloat16 conversion. Just change data_type flags to any.

Support Matrix

• FP16
• FP8
• INT8 & INT4 Weight-Only
• FP8 KV CACHE
• Tensor Parallel
• STRONGLY TYPED

MPT 7B

1. Convert weights from HF Tranformers to FT format

The hf_gpt_convert.py script allows you to convert weights from HF Tranformers format to FT format.

python convert_hf_mpt_to_ft.py -i mosaicml/mpt-7b -o ./ft_ckpts/mpt-7b/fp16/ -t float16

python convert_hf_mpt_to_ft.py -i mosaicml/mpt-7b -o ./ft_ckpts/mpt-7b/fp32/ --tensor_parallelism 4 -t float32

--infer_gpu_num 4 is used to convert to FT format with 4-way tensor parallelism

2. Build TensorRT engine(s)

Examples of build invocations:

# Build a single-GPU float16 engine using FT weights.
python3 build.py --model_dir=./ft_ckpts/mpt-7b/fp16/1-gpu \
                 --max_batch_size 64 \
                 --use_gpt_attention_plugin \
                 --use_gemm_plugin \
                 --output_dir ./trt_engines/mpt-7b/fp16/1-gpu

# Build 4-GPU MPT-7B float32 engines
# Enable several TensorRT-LLM plugins to increase runtime performance. It also helps with build time.
python3 build.py --world_size=4 \
                 --parallel_build \
                 --max_batch_size 64 \
                 --max_input_len 512 \
                 --max_output_len 64 \
                 --use_gpt_attention_plugin \
                 --use_gemm_plugin \
                 --model_dir ./ft_ckpts/mpt-7b/fp32/4-gpu \
                 --output_dir=./trt_engines/mpt-7b/fp32/4-gpu

3. Run TRT engine to check if the build was correct

python run.py --engine_dir ./trt_engines/mpt-7b/fp16/1-gpu/ --max_output_len 10

# Run 4-GPU MPT7B TRT engine on a sample input prompt
mpirun -n 4 --allow-run-as-root python run.py --engine_dir ./trt_engines/mpt-7b/fp32/4-gpu/ --max_output_len 10

MPT 30B

Same commands can be changed to convert MPT 30B to TRT LLM format. Below is an example to build MPT30B fp16 4-way tensor parallelized TRT engine

1. Convert weights from HF Tranformers to FT format

The convert_hf_mpt_to_ft.py script allows you to convert weights from HF Tranformers format to FT format.

python convert_hf_mpt_to_ft.py -i mosaicml/mpt-30b -o ./ft_ckpts/mpt-7b/fp16/ --tensor_parallelism 4 -t float16

--infer_gpu_num 4 is used to convert to FT format with 4-way tensor parallelism

2. Build TensorRT engine(s)

Examples of build invocations:

# Build 4-GPU MPT-30B float16 engines
# ALiBi is not supported with GPT attention plugin so we can't use that plugin to increase runtime performance
python3 build.py --world_size=4 \
                 --parallel_build \
                 --max_batch_size 64 \
                 --max_input_len 512 \
                 --max_output_len 64 \
                 --use_gpt_attention_plugin \
                 --use_gemm_plugin \
                 --model_dir ./ft_ckpts/mpt-30b/fp16/4-gpu \
                 --output_dir=./trt_engines/mpt-30b/fp16/4-gpu

3. Run TRT engine to check if the build was correct

# Run 4-GPU MPT7B TRT engine on a sample input prompt
mpirun -n 4 --allow-run-as-root python run.py --engine_dir ./trt_engines/mpt-30b/fp16/4-gpu/ --max_output_len 10