onnxruntime

67c87a19 - [WebNN] Fallback unsupported integer input and output of a WebNN graph to int32 (#24425)

[WebNN] Fallback unsupported integer input and output of a WebNN graph to int32 (#24425) Some WebNN backends support limited data types for the input and output of a WebNN graph. However, they can support more data types for intermediate nodes. To address this limitation, we implement a data type fallback mechanism. (Note: Currently, we only support fallback to int32 for certain integer data types.) If a data type is not supported for a graph's input or output but is supported for intermediate nodes, we will: 1. Save the input MLTensor as 'int32' data type, 2. Convert the input data from ORT to int32, 3. Insert a cast operation to WebNN graph to convert the input back to its original data type, 4. Insert a cast operation to WebNN graph to convert the output back to 'int32', 5. Convert the output data from int32 to its original data type.