Resolved UserWarnings after QONNX to FINN conversion.

src/finn/transformation/convert_qonnx_to_finn.py

@@ -37,6 +37,7 @@ from finn.custom_op.registry import getCustomOp
 from finn.transformation.base import Transformation
 from finn.transformation.infer_datatypes import InferDataTypes
 from finn.transformation.infer_shapes import InferShapes
+from finn.util.basic import get_by_name
 
 
 class ConvertQONNXtoFINN(Transformation):
@@ -54,8 +55,6 @@ class ConvertQONNXtoFINN(Transformation):
         model = model.transform(FoldQuantWeights())
         # Convert activations
         model = model.transform(ConvertQuantActToMultiThreshold())
-        # Some datatypes have changed
-        model = model.transform(InferDataTypes())
 
         return (model, False)
 
@@ -344,6 +343,13 @@ class QuantActBaseHandler(ABC):
         graph.node.insert(running_node_index, outp_trans_node)
         running_node_index += 1
 
+        # Unset the FINN datatype
+        qnt_annotations = model._model_proto.graph.quantization_annotation
+        ret = get_by_name(qnt_annotations, n.output[0], "tensor_name")
+        ret.Clear()
+        # ToDo: This should be supported by finn-base, by calling the following:
+        # model.set_tensor_datatype(n.output[0], None)
+
         # Insert Add node
         if adder_bias.shape == (1,):
             adder_bias = adder_bias[0]