[Execution] Added verification of node layout for MultiThreshold node

src/finn/custom_op/layout_custom_ops.py

+from enum import Enum, auto
+from finn.core.utils import get_by_name
+
+class CustomOp_Layout(Enum):
+    MultiThreshold = auto()
+    #XnorPopcountMatMul = auto()
+    #StreamingMaxPool_Batch = auto()
+    #StreamingFCLayer_Batch = auto()
+
+    def verify_layout(self, node):
+        assert self.verify_num_of_attr(node) == True, 'Number of attributes is not correct'
+        assert self.verify_domain_is_finn(node) == True, 'Domain name is not "finn"'
+        if self.name in ["StreamingMaxPool_Batch", "StreamingFCLayer_Batch"]:
+            assert self.verify_backend_is_fpgadataflow(node) == True, 'Attribute backend has to be set to "fpgadataflow"'
+        assert self.verify_all_attr(node) == True, 'The attributes are not correct'
+          
+    def verify_num_of_attr(self, node):
+        if self.name == "MultiThreshold":
+            num_of_attr = 3
+        #elif self.name == "XnorPopcountMatMul":
+            #num_of_attr =
+        #elif self.name == "StreamingMaxPool_Batch":
+            #num_of_attr =
+        #elif self.name == "StreamingFCLayer_Batch":
+            #num_of_attr =
+        if len(node.attribute) == num_of_attr:
+            return True
+        else:
+            return False
+
+    def verify_domain_is_finn(self, node):
+        domain_value = node.domain
+
+        if domain_value == "finn":
+            return True
+        else:
+            return False
+
+    def verify_backend_is_fpgadataflow(self, node):
+        #only for HLS CustomOp
+        backend_value = get_by_name(node.attribute, "backend")
+        if backend_value == "fpgadataflow":
+            return True
+        else:
+            return False
+
+    def verify_all_attr(self, node):
+        if self.name == "MultiThreshold":
+            try:
+                get_by_name(node.attribute, "out_scale")
+                get_by_name(node.attribute, "out_bias")
+                get_by_name(node.attribute, "out_dtype")
+                return True
+            except:
+                return False
+        
+        
+    
+
+