Mixed-precision quantization
Mixed-precision quantization is a more flexible approach that leverages multiple levels of numerical precision within a single model. For instance, less critical layers of the model can use INT8, while more sensitive layers remain in FP16 or FP32. This allows greater control over the trade-off between performance and precision. Using mixed-precision quantization can significantly reduce model size and inference time while keeping critical aspects of the LLM intact.
The following code demonstrates an example of quantization to optimize memory usage and speed in LLM training or inference:
from torch.cuda.amp import autocast # Mixed precision in LLM training or inference model = ... # Use FP16 where possible, fall back to FP32 for sensitive computations with autocast(): output = model(input_data)
In this example, we use the autocast()
function from PyTorch’s Automatic Mixed Precision (AMP) library to enable FP16 computation...