torchao.quantization.qat

Created On: Dec 17, 2025 | Last Updated On: Dec 17, 2025

Main Config for quantize_

For a full example of how to use QAT with our main quantize_ API, please refer to the QAT README.

QATConfig	Config for applying quantization-aware training (QAT) to a torch.nn.Module, to be used with quantize_().
QATStep	Enum value for the step field in QATConfig.

Custom QAT APIs

FakeQuantizeConfigBase	Base class for representing fake quantization config.
IntxFakeQuantizeConfig	Config for how to fake quantize weights or activations, targeting integer dtypes up to torch.int8.
Float8FakeQuantizeConfig	Config for float8 fake quantization, targeting Float8Tensor.
FakeQuantizedLinear	General linear layer with fake quantized weights and activations.
FakeQuantizedEmbedding	General embedding layer with fake quantized weights.
FakeQuantizerBase	Generic module for applying fake quantization to a tensor, as specified in the config.
IntxFakeQuantizer	Generic module for applying integer fake quantization to a tensor, as specified in the config.
Float8FakeQuantizer	Generic module for applying float8 fake quantization to a tensor, as specified in the config.
linear.enable_linear_fake_quant	Helper function to enable fake quantization in FakeQuantizedLinear.
linear.disable_linear_fake_quant	Helper function to disable fake quantization in FakeQuantizedLinear.

Legacy QAT APIs

IntXQuantizationAwareTrainingConfig	(Deprecated) Please use QATConfig instead.
FromIntXQuantizationAwareTrainingConfig	(Deprecated) Please use QATConfig instead.
Int4WeightOnlyQATQuantizer	Quantizer for performing QAT on a model, where linear layers have int4 fake quantized grouped per channel weights.
linear.Int4WeightOnlyQATLinear	This module implements a linear layer with int4 fake quantized grouped per channel weights, with forward numerics matching WeightOnlyInt4Linear, which uses the efficient int4 tinygemm kernel.
Int8DynActInt4WeightQATQuantizer	Quantizer for performing QAT on a model, where linear layers have int8 dynamic per token fake quantized activations and int4 fake quantized grouped per channel weights.
linear.Int8DynActInt4WeightQATLinear	This module implements a linear layer with int8 dynamic per token fake quantized activations with int4 fake quantized grouped per channel weights.
Int4WeightOnlyEmbeddingQATQuantizer	Quantizer for performing QAT on a model, where embedding layers have int4 fake quantized grouped per channel weights.
embedding.Int4WeightOnlyQATEmbedding	This module implements a embedding layer with int4 fake quantized grouped per channel weights.
embedding.Int4WeightOnlyEmbedding	This module implements a embedding layer with int4 quantized grouped per channel weights.
Float8ActInt4WeightQATQuantizer	QAT quantizer for applying dynamic rowwise float8 activation + int4 per group/channel symmetric weight fake quantization to linear layers in the model.
ComposableQATQuantizer	Composable quantizer that users can use to apply multiple QAT quantizers easily.

Prototype

initialize_fake_quantizers

(Prototype) Initialize the scales and zero points on all IntxFakeQuantizerBase in the model based on the provided example inputs.