Neural network processing

A sequence of operations to process an initial input data array for the sequence of operations to generate a final output data array of the sequence of operations on a processor operable to execute neural network processing, the sequence are performed for respective blocks of the initial input data array on a block-by-block basis, and when performing an operation in the sequence whose output data is input data for another operation in the sequence, the output data is used as input data for another operation of the sequence is stored in local storage of the processor that is performing the neural network processing, and provided as input data for the another operation in the sequence from the local storage, but for the final operation in the sequence, the final output data array is stored in a main memory of the data processing system.