matteosal opened a new issue #20471: URL: https://github.com/apache/incubator-mxnet/issues/20471
[sym.zip](https://github.com/apache/incubator-mxnet/files/6885370/sym.zip) I only see this on Windows. Download the symbol file and run this script: ``` import mxnet as mx json_path = 'sym.json' sym = mx.sym.load(json_path) def run_example(ctx, reqs): ex = sym._bind( ctx, { '.Inputs.Input': mx.ndarray.array([[1, 2, 3]], ctx=ctx), '.Inputs.Target': mx.ndarray.array([[4, 5, 6]], ctx=ctx), 'seq_715248120': mx.ndarray.array([3], ctx=ctx) }, args_grad={ '.Inputs.Input': mx.ndarray.zeros([1, 3], ctx=ctx), '.Inputs.Target': mx.ndarray.zeros([1, 3], ctx=ctx), 'seq_715248120': mx.ndarray.zeros([1], ctx=ctx) }, grad_req=dict(zip(['.Inputs.Input', '.Inputs.Target', 'seq_715248120'], reqs)) ) ex.forward() ex.backward(out_grads=[mx.ndarray.array([1], ctx=ctx), mx.ndarray.array([1], ctx=ctx)]) print(ex.grad_dict) print('Input + Target gradient, CPU (OK):') run_example(mx.cpu(), ['write', 'write', 'null']) print('\n') print('Input + Target gradient, GPU (OK):') run_example(mx.gpu(), ['write', 'write', 'null']) print('\n') print('Target gradient only, CPU (OK):') run_example(mx.cpu(), ['null', 'write', 'null']) print('\n') print('Target gradient only, GPU (WRONG):') run_example(mx.gpu(), ['null', 'write', 'null']) ``` Output is: ``` Input + Target gradient, CPU (OK): {'.Inputs.Input': [[-0.33333334 -0.33333334 -0.33333334]] <NDArray 1x3 @cpu(0)>, '.Inputs.Target': [[0.33333334 0.33333334 0.33333334]] <NDArray 1x3 @cpu(0)>, 'seq_715248120': None} Input + Target gradient, GPU (OK): {'.Inputs.Input': [[-0.33333334 -0.33333334 -0.33333334]] <NDArray 1x3 @gpu(0)>, '.Inputs.Target': [[0.33333334 0.33333334 0.33333334]] <NDArray 1x3 @gpu(0)>, 'seq_715248120': None} Target gradient only, CPU (OK): {'.Inputs.Input': None, '.Inputs.Target': [[0.33333334 0.33333334 0.33333334]] <NDArray 1x3 @cpu(0)>, 'seq_715248120': None} Target gradient only, GPU (WRONG): {'.Inputs.Input': None, '.Inputs.Target': [[-0.33333334 -0.33333334 -0.33333334]] <NDArray 1x3 @gpu(0)>, 'seq_715248120': None} ``` The `Target` gradient has the sign flipped in the last example. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
