[member function] Changed get_nodeattr_types by moving "backend" attribute to...

[member function] Changed get_nodeattr_types by moving "backend" attribute to __init__ instead of in each fpgadataflow custom op class

src/finn/custom_op/fpgadataflow/__init__.py

@@ -40,7 +40,11 @@ class HLSCustomOp(CustomOp):
         self.code_gen_dict = {}
 
     def get_nodeattr_types(self):
-        return {"code_gen_dir": ("s", False, ""), "executable_path": ("s", False, "")}
+        return {
+            "backend": ("s", True, "fpgadataflow"),
+            "code_gen_dir": ("s", False, ""),
+            "executable_path": ("s", False, ""),
+        }
 
     def code_generation(self, model):
         node = self.onnx_node

src/finn/custom_op/fpgadataflow/streamingfclayer_batch.py

@@ -14,9 +14,9 @@ class StreamingFCLayer_Batch(HLSCustomOp):
 
     def get_nodeattr_types(self):
         my_attrs = {
-            "backend": ("s", True, "fpgadataflow"),
-            "code_gen_dir": ("s", True, ""),
-            "executable_path": ("s", True, ""),
+            # "backend": ("s", True, "fpgadataflow"),
+            # "code_gen_dir": ("s", True, ""),
+            # "executable_path": ("s", True, ""),
             "PE": ("i", True, 0),
             "SIMD": ("i", True, 0),
             "MW": ("i", True, 0),

src/finn/custom_op/fpgadataflow/streamingmaxpool_batch.py

@@ -4,9 +4,9 @@ from finn.custom_op.fpgadataflow import HLSCustomOp
 class StreamingMaxPool_Batch(HLSCustomOp):
     def get_nodeattr_types(self):
         my_attrs = {
-            "backend": ("s", True, "fpgadataflow"),
-            "code_gen_dir": ("s", True, ""),
-            "executable_path": ("s", True, ""),
+            # "backend": ("s", True, "fpgadataflow"),
+            # "code_gen_dir": ("s", True, ""),
+            # "executable_path": ("s", True, ""),
             "ImgDim": ("i", True, 0),
             "PoolDim": ("i", True, 0),
             "NumChannels": ("i", True, 0),