Simplified PTQ Configuration File

Table 1 describes the fields in the calibration_config_caffe.proto file. Find the file in /amct_caffe/proto/calibration_config_caffe.proto under the AMCT installation directory.

**Table 1** calibration_config_caffe.proto
Parameter	Required/Optional	Type	Field	Description
AMCTConfig	-	-	-	Simplified PTQ configuration of AMCT.
	Optional	UInt32	batch_num	Batch number for quantization.
	Optional	Boolean	activation_offset	Whether to quantize activations with offset. It is a global configuration parameter. true: with offset. Activations are asymmetrically quantized. false: without offset. Activations are symmetrically quantized.
	Optional	Boolean	joint_quant	Eltwise joint quantization switch. Defaults to false, indicating that joint quantization is disabled. If true, the network performance may improve but the precision may be compromised.
	Repeated	String	skip_layers	Layers to skip quantization.
	Repeated	String	skip_layer_types	Types of layers to skip quantization.
	Optional	CalibrationConfig	common_config	Common quantization configuration, which is a global parameter. Use this configuration if a layer is not overridden by override_layer_types or override_layer_configs. Parameter priority: override_layer_configs > override_layer_types > common_config
	Repeated	OverrideLayerType	override_layer_types	Certain types of layers to override the quantization configurations. It is used to determine which layers are to be differentiatedly quantized. By using this parameter, you can perform differentiated quantization on some layers to change the quantization factor search step from 0.01 to 0.02. Parameter priority: override_layer_configs > override_layer_types > common_config
	Repeated	OverrideLayer	override_layer_configs	Layer to override the quantization configurations. It is used to determine which layers are to be differentiatedly quantized. By using this parameter, you can perform differentiated quantization on some layers to change the quantization factor search step from 0.01 to 0.02. Parameter priority: override_layer_configs > override_layer_types > common_config
	Optional	Boolean	do_fusion	BN fusion switch. Defaults to true, indicating BN fusion enabled.
	Repeated	String	skip_fusion_layers	Layers to skip BN fusion.
	Optional	CalibrationConfig	conv_calibration_config	Quantization configuration of the Convolution and Deconvolution layers that are not overridden. Deprecated, which is not recommended.
	Optional	CalibrationConfig	fc_calibration_config	Quantization configuration of InnerProduct and AVE Pooling layers that are not overridden. Deprecated, which is not recommended.
OverrideLayerType	-	-	-	Quantization configuration to override by layer type.
	Required	String	layer_type	Quantizable layer type.
	Required	CalibrationConfig	calibration_config	Quantization configuration to override.
OverrideLayer	-	-	-	Quantization configuration to override by layer.
	Required	String	layer_name	Layers to override.
	Required	CalibrationConfig	calibration_config	Quantization configuration to override.
CalibrationConfig	-	-	-	Calibration-based quantization configuration.
	-	ARQuantize	arq_quantize	Weight quantization algorithm configuration. arq_quantize: ARQ algorithm configuration.
	-	FMRQuantize	ifmr_quantize	Activation quantization algorithm configuration. ifmr_quantize: IFMR algorithm configuration.
	-	HFMGQuantize	hfmg_quantize	Activation quantization algorithm configuration. hfmg_quantize: HFMG algorithm configuration.
ARQuantize	-	-	-	ARQ algorithm configuration. For details about the algorithm, see ARQ.
ARQuantize	Optional	Boolean	channel_wise	Whether to use different quantization factors for each channel.
FMRQuantize	-	-	-	FMR algorithm configuration for activation quantization. For details about the algorithm, see IFMR Algorithm. This algorithm cannot be configured together with the HFMGQuantize algorithm. If they are configured together, the quantization algorithm configured last in the configuration file is used.
	Optional	Float	search_range_start	Quantization factor search start.
	Optional	Float	search_range_end	Quantization factor search end.
	Optional	Float	search_step	Quantization factor search step.
	Optional	Float	max_percentile	Upper bound for searching for the largest.
	Optional	Float	min_percentile	Lower bound for searching for the smallest.
	Optional	Boolean	asymmetric	Whether to perform symmetric quantization. It is used to select the layer-wise quantization algorithm. true: asymmetric quantization false: symmetric quantization If this parameter is set for override_layer_configs, override_layer_types, and common_config, or if the activation_offset parameter is set, the priority is as follows: override_layer_configs > override_layer_types > common_config > activation_offset
HFMGQuantize	-	-	-	HFMG algorithm configuration for activation quantization. For details about the algorithm, see HFMG Algorithm. This algorithm cannot be configured together with the FMRQuantize algorithm. If they are configured together, the quantization algorithm configured last in the configuration file is used.
	Optional	UInt32	num_of_bins	Number of bins (the minimum unit in a histogram). Value range: {1024, 2048, 4096, 8192}. Defaults to 4096.
	Optional	Boolean	symmetric	Whether to perform symmetric quantization. It is used to select the layer-wise quantization algorithm. true: asymmetric quantization false: symmetric quantization If this parameter is set for override_layer_configs, override_layer_types, and common_config, or if the activation_offset parameter is set, the priority is as follows: override_layer_configs > override_layer_types > common_config > activation_offset

The following is an example of the simplified PTQ configuration file (quant.cfg).

# global quantize parameter
batch_num : 2
activation_offset : true
joint_quant : false
skip_layers : "Opname"
skip_layer_types:"Optype"
do_fusion: true
skip_fusion_layers : "Opname"
common_config : {
    arq_quantize : {
        channel_wise : true
    }
    ifmr_quantize : {
        search_range_start : 0.7
        search_range_end : 1.3
        search_step : 0.01
        max_percentile : 0.999999
        min_percentile : 0.999999
         asymmetric : true
    }
}
 
override_layer_types : {
    layer_type : "Optype"
    calibration_config : {
        arq_quantize : {
            channel_wise : false
        }
        ifmr_quantize : {
            search_range_start : 0.8
            search_range_end : 1.2
            search_step : 0.02
            max_percentile : 0.999999
            min_percentile : 0.999999
              asymmetric : false
        }
    }
}
 
override_layer_configs : {
    layer_name : "Opname"
    calibration_config : {
        arq_quantize : {
            channel_wise : true
        }
        ifmr_quantize : {
            search_range_start : 0.8
            search_range_end : 1.2
            search_step : 0.02
            max_percentile : 0.999999
            min_percentile : 0.999999
              asymmetric : false
        }
    }
}

If the HFMG algorithm is used for activation quantization, replace the lines in bold in the preceding configuration file with the following ones. (The following configuration file is only an example. Modify it as required.)

# global quantize parameter
activation_offset : true
batch_num : 1
...
common_config : {
    hfmg_quantize : {
        num_of_bins : 4096
         asymmetric : false
    }
...
}

Parent topic: Reference