diff --git a/chunk_codegen.py b/chunk_codegen.py
index 6740cd44a..2dc44d381 100644
--- a/chunk_codegen.py
+++ b/chunk_codegen.py
@@ -200,8 +200,12 @@ class NodeIndexTracer(object):
         Args:
             node (node)
             node_idx (int)
-        """  
-        input_node, weight, bias = node.args
+        """
+        if len(node.args) == 2:
+            input_node, weight = node.args
+            bias = None
+        else:
+            input_node, weight, bias = node.args
         input_node_idx_trace = self._find_idx_trace_from_node(input_node)
         weight_idx_trace = self._find_idx_trace_from_node(weight)
         
@@ -284,6 +288,53 @@ class NodeIndexTracer(object):
         self._assign_index_as_input(node, idx)
         self._inherit_computation(node.args[0], node)
         self._mark_computation(node, idx, [node.kwargs['dim']])
+        
+    def _assign_unsqueeze_index(self, node, node_idx):
+        """
+        Assign index for unsqueeze op.
+        1. assign new index for unsqueeze dim
+
+        Args:
+            node (node)
+            node_idx (int)
+        """ 
+        self._assign_index_as_input(node, node_idx)
+        self._inherit_computation(node.args[0], node)
+        self.idx_trace_list[node_idx]['idx'].insert(node.args[1], self._add_index())
+        
+    def _assign_dropout_index(self, node, node_idx):
+        """
+        Assign index for unsqueeze op.
+        1. assign new index for unsqueeze dim
+
+        Args:
+            node (node)
+            node_idx (int)
+        """ 
+        self._assign_index_as_input(node, node_idx)
+
+        
+    def _assign_ones_like_index(self, node, node_idx):
+        """
+        Assign index for oneslike op.
+        1. assign new index for all dim
+
+        Args:
+            node (node)
+            node_idx (int)
+        """ 
+        self._assign_all_index(node, node_idx)
+        
+    def _assign_to_index(self, node, node_idx):
+        """
+        Assign index for to op.
+        1. assign new index for all dim
+
+        Args:
+            node (node)
+            node_idx (int)
+        """ 
+        self._assign_index_as_input(node, node_idx)
 
     def _assign_view_reshape_index(self, node, node_idx):
         """
@@ -388,6 +439,10 @@ class NodeIndexTracer(object):
                     self._assign_permute_index(node, idx)
                 elif 'view' in node.name or 'reshape' in node.name:
                     self._assign_view_reshape_index(node, idx)
+                elif 'unsqueeze' in node.name:
+                    self._assign_unsqueeze_index(node, idx)
+                elif 'to' in node.name:
+                    self._assign_to_index(node, idx)
                 else:
                     raise NotImplementedError(node.name, "method not implemented yet!")
             elif node.op == 'call_function':
@@ -399,6 +454,10 @@ class NodeIndexTracer(object):
                     self._assign_softmax_index(node, idx)
                 elif any(n in node.name for n in ['mul', 'add', 'sigmoid', 'relu']):
                     self._assign_elementwise_index(node, idx)
+                elif 'ones_like' in node.name:
+                    self._assign_ones_like_index(node, idx)
+                elif 'dropout' in node.name:
+                    self._assign_dropout_index(node, idx)
                 elif 'getattr' in node.name:
                     continue # get attr like shape
                 elif 'getitem' in node.name: