eric-haibin-lin commented on issue #10154: Symbol API's Concat operator inconsistent with NDArray API's Concat operator URL: https://github.com/apache/incubator-mxnet/issues/10154#issuecomment-374319967 If you check the your inputs for symbols, they're 3-D with dim0 = 1: ``` [ [[[ 3. 3.] [ 4. 4.] [ 5. 5.]]] <NDArray 1x3x2 @cpu(0)>, [[[ 6. 6.] [ 7. 7.] [ 8. 8.]]] <NDArray 1x3x2 @cpu(0)>] ``` If you use `data_forward.append(mx.nd.array(val))` instead of `data_forward.append(mx.nd.array([val]))`, the symbol output will be ``` **Concat Output** from symbol API [[ 3. 3. 6. 6.] [ 4. 4. 7. 7.] [ 5. 5. 8. 8.]] <NDArray 3x4 @cpu(0)> ``` Let me know if it doens't work
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