The present disclosure relates to a data processing apparatus for a processing resource to perform a transform operation on an input tensor for the processing resource, said input tensor being formed of a plurality of blocks, each block being a portion of said input tensor capable of being operated on independently of each other, said data processing apparatus comprising: communication circuitry to communicate with a control module and a shared storage of said processing resource; processing circuitry to perform said transform operation, said processing circuitry comprising sub-block processing circuitry and transformation circuitry; and a local storage to store transform operation output from said processing circuitry; wherein said communication circuitry is configured to: receive one or more transform parameters; read a first input sub-block from said shared storage, said first input sub-block being a portion of a first block of said input tensor corresponding to a processing unit of said processing circuitry; and write a first output sub-block to said shared storage, wherein said sub-block processing circuitry is configured to: divide said first block of said input tensor into one or more input sub-blocks capable of being operated on independently of each other based on said one or more transform parameters; and wherein said transformation circuitry is configured to: perform said transform operation on said first input sub-block based on said one or more transform parameters to generate said first output sub-block; and write said first output sub-block to said local storage.