lgraph = [...
 sequenceInputLayer([64 5 1], "MinLength",4)
 % convolution2dLayer([3,3],1) % If include this conv2d layer cause
 % ERROR CUDNN_STATUS_EXECUTION_FAILED
 flattenLayer
 gruLayer(16)
 fullyConnectedLayer(16)
 fullyConnectedLayer(2)
 softmaxLayer
 classificationLayer
 ]

lgraph = [...
 sequenceInputLayer([64 5 1], "MinLength",4)
 sequenceFoldingLayer('Name','fold')
 convolution2dLayer([3,3],1)
 sequenceUnfoldingLayer('Name','unfold')
 flattenLayer
 gruLayer(16)
 fullyConnectedLayer(16)
 fullyConnectedLayer(2)
 softmaxLayer
 classificationLayer
 ]
lgraph = connectLayers(lgraph,'fold/miniBatchSize','unfold/miniBatchSize');