Working with examples

- Add Aitor CV as sample data
- Add button to explicitly create langchain
- Fix placeholder text

app.py

@@ -14,10 +14,9 @@ def set_openai_key(raw_key):
     response = requests.get("https://api.openai.com/v1/engines", headers=headers)
     if response.status_code != 200:
         raise gr.Error("API key is not valid. Check the key and try again.")
-    
+
     os.environ["OPENAI_API_KEY"] = raw_key
-    
-    return gr.File.update(interactive=True)
+    return gr.File.update(interactive=True), gr.Button.update(interactive=True)
 
 
 def create_langchain(pdf_object):
@@ -40,6 +39,9 @@ def ask_question(chain, question_text):
 
 
 with gr.Blocks() as demo:
+    # Sate objects
+    chain_state = gr.State()
+
     # Layout
     oai_token = gr.Textbox(
         label="OpenAI Token",
@@ -52,21 +54,26 @@ with gr.Blocks() as demo:
         type="file",
         interactive=False,
     )
+    gr.Examples(
+        examples=[
+            os.path.join(os.path.abspath(""), "sample_data", "CV_AITOR_MIRA.pdf")
+        ],
+        inputs=pdf_object,
+        label="Example CV",
+    )
+    create_chain_btn = gr.Button(value="Create CVchat", interactive=False)
 
-    question_placeholder = """
-    Enumerate the candidate's top 5 hard skills and rate them by importance from 0 to 5.
-    Example:
-    - Algebra 5/5 
-    """
+    question_placeholder = """Enumerate the candidate's top 5 hard skills and rate them by importance from 0 to 5.
+Example:
+- Algebra 5/5"""
     question_box = gr.Textbox(label="Question", value=question_placeholder)
     qa_button = gr.Button(value="Submit question", interactive=False)
 
-    # Sate objects
-    chain_state = gr.State()
-
     # Actions
-    oai_token.change(set_openai_key, inputs=oai_token, outputs=pdf_object)
-    lchain = pdf_object.change(
+    oai_token.change(
+        set_openai_key, inputs=oai_token, outputs=[pdf_object, create_chain_btn]
+    )
+    lchain = create_chain_btn.click(
         create_langchain, inputs=pdf_object, outputs=[chain_state, qa_button]
     )
     qa_button.click(