public override KerasSymbol[] Invoke(KerasSymbol[] inputs, FuncArgs kwargs = null) { List <KerasSymbol> result = new List <KerasSymbol>(); foreach (var input in inputs) { if (this.data_format == "channels_first") { // Ensure works for any dim var permutation = new List <int> { 0 }; permutation.AddRange((from i in Enumerable.Range(2, K.NDim(input) - 2) select i).ToList()); permutation.Add(1); result.Add(K.PermuteDimensions(input, new Shape(permutation))); } else { result.Add(K.BatchFlatten(input)); } } return(result.ToArray()); }