Hi @ishan
About how this pre-cluster-threshold is used, you can check code
File: /opt/nvidia/deepstream/deepstream-5.0/sources/libs/nvdsinfer_customparser/nvdsinfer_custombboxparser.cpp
`float threshold = detectionParams.perClassPreclusterThreshold[c];`
the value of above perClassPreclusterThreshold is the value of pre-cluster-threshold you defined in the configure file,