Which component does not belong to the common calculation unit.

NVM Express (NVMe) is a logical device connection specification that relies on the PCIE bus. NVMe equipment can be applied to various physical slots supporting PCLE and bus.

Middleware is mainly to provide running and development environment for upper-layer application software, provide pre-made and reusable business function modules, API interface, etc. to help users flexibly and efficiently develop and integrate complex application systems.

A cluster is a group of service entities that work together to improve efficiency by improving the tasks performed within the unit.

What are the following application scenarios that do not belong to FPGA?