Updated

Lang_Graph.html

@@ -164,6 +164,25 @@
             workflow.add_edge(START, "Node_B")
         </pre>
    </p>
+  <p>
+        Now, apart from nodes being python functions, we can add variety of things  like LCEL (Lang Chain Expression Language), sub graphs etc.
+        Consider the following:
+        <pre>
+            ..
+            model = ChatOpenAI(model="..")
+            prompt = ChatPromptTemplate.from_template("Summarize this text in one sentence: {input_text}")
+            lcel_chain = prompt | model | (lambda msg: {"summary": msg.content})
+            we can pass this as a node to a lang graph.
+            workflow.add_node("summarizer_node", lcel_chain)
+        </pre>
+        Or sometimes, we may need a placeholder node, something like below
+        <pre>
+            def DUMMY(state: State):
+                pass
+            workflow.add_node(DUMMY)
+        </pre>
+        You may also try to pass another workflow graph as subgraph.
+   </p>
     <h3>Detailed article coming soon ..</h3>
      
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