[Driver] use compatible data for throughput testing

src/finn/qnn-data/templates/driver/driver_base.py

@@ -37,6 +37,8 @@ from finn.util.data_packing import (
     packed_bytearray_to_finnpy,
 )
 
+from finn.util.basic import gen_finn_dt_tensor
+
 # Driver base class for FINN-generated dataflow accelerators.
 # The particulars of the generated accelerator are specified via the
 # io_shape_dict (generated by the MakePYNQDriver transformation).
@@ -344,7 +346,7 @@ class FINNExampleOverlay(Overlay):
             res["fclk[mhz]"] = self.clock_dict["clock0"]["frequency"]
         res["batch_size"] = self.batch_size
         # also benchmark driver-related overheads
-        input_npy = np.zeros(self.ishape_normal, dtype=self.idt.to_numpy_dt())
+        input_npy = gen_finn_dt_tensor(self.idt, self.ishape_normal)
         start = time.time()
         ibuf_folded = self.fold_input(input_npy)
         end = time.time()