ISA generated by relay.build() for deployment on VTA

Where can I find the ISA being generated for a relay.build() for deployment on VTA? Where is the binary stream being produced. I know that the graph produced by the relay.build is sent to the FPGA board through remote.upload and we get back the TVM module through remote.load_module.(Let me know if this is wrong). I want to know how the relay interacts with VTA API? Thanks