  By representing each collider event as a point cloud, we adopt the Graphic
Convolutional Network (GCN) with focal loss to reconstruct the Higgs jet in it.
This method provides higher Higgs tagging efficiency and better reconstruction
accuracy than the traditional methods which use jet substructure information.
The GCN, which is trained on events of the $H$+jets process, is capable of
detecting a Higgs jet in events of several different processes, even though the
performance degrades when there are boosted heavy particles other than the
Higgs in the event. We also demonstrate the signal and background
discrimination capacity of the GCN by applying it to the $t\bar{t}$ process.
Taking the outputs of the network as new features to complement the traditional
jet substructure variables, the $t\bar{t}$ events can be separated further from
the $H$+jets events.
