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app.py
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import openai
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import streamlit as st
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from streamlit.components.v1 import html
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from streamlit_extras.stylable_container import stylable_container
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import re
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import urllib.parse
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import traceback
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import tiktoken
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st.title("Nvidia Chat UI")
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if "api_key" not in st.session_state:
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api_key = st.text_input("Enter your API Key", type="password")
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if api_key:
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if api_key.isascii():
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st.session_state.api_key = api_key
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client = openai.OpenAI(base_url = "https://integrate.api.nvidia.com/v1",
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api_key=api_key)
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st.rerun()
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else:
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st.warning("Please enter your API key correctly.")
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st.stop()
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else:
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st.warning("Please enter your API key to use the app. You can obtain your API key from here: https://build.nvidia.com/nvidia/nemotron-4-340b-instruct")
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st.stop()
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else:
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client = openai.OpenAI(base_url = "https://integrate.api.nvidia.com/v1",
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api_key=st.session_state.api_key)
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if "messages" not in st.session_state:
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st.session_state.messages = []
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encoding = tiktoken.get_encoding("cl100k_base")
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def num_tokens_from_string(string):
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num_tokens = len(encoding.encode(string))
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return num_tokens
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def get_ai_response(prompt, chat_history):
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st.session_state.is_streaming = True
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st.session_state.response = ""
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chat_history.insert(0, {"role": "system", "content": system_prompt})
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chat_history.append({"role": "user", "content": prompt})
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system_tokens = num_tokens_from_string(system_message["content"])
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user_tokens = num_tokens_from_string(user_message["content"])
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# Maximum allowed tokens
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context_length = 4096 - max_tokens
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available_tokens = context_length - system_tokens - user_tokens
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# Trim chat history if necessary
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trimmed_history = []
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total_tokens = 0
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for message in reversed(chat_history):
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message_tokens = num_tokens_from_string(message["content"])
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if total_tokens + message_tokens <= available_tokens:
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trimmed_history.insert(0, message)
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total_tokens += message_tokens
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else:
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break
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# Construct final message list
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final_messages = [system_message] + trimmed_history + [user_message]
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try:
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with st.chat_message("assistant", avatar=st.session_state.assistant_avatar):
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stream = client.chat.completions.create(
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model=model,
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messages=chat_history,
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temperature=temperature,
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top_p=top_p,
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max_tokens=max_tokens,
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stream=True,
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)
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placeholder = st.empty()
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with stylable_container(
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key="stop_generating",
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css_styles="""
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button {
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position: fixed;
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bottom: 100px;
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left: 50%;
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transform: translateX(-50%);
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z-index: 1;
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}
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""",
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):
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st.button("Stop generating")
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shown_message = ""
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for chunk in stream:
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if chunk.choices[0].delta.content is not None:
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content = chunk.choices[0].delta.content
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st.session_state.response += content
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shown_message += content.replace("\n", " \n")\
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.replace("<", "\\<")\
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.replace(">", "\\>")
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placeholder.markdown(shown_message)
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except:
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st.session_state.response += "\n!Exception\n" + traceback.format_exc()
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st.session_state.is_streaming = False
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return st.session_state.response
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def normalize_code_block(match):
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return match.group(0).replace(" \n", "\n")\
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.replace("\\<", "<")\
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.replace("\\>", ">")
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def normalize_inline(match):
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return match.group(0).replace("\\<", "<")\
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.replace("\\>", ">")
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code_block_pattern = r"(```.*?```)"
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inline_pattern = r"`([^`\n]+?)`"
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def display_messages():
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for i, message in enumerate(st.session_state.messages):
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avatar = st.session_state.user_avatar if message["role"] == "user" else st.session_state.assistant_avatar
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with st.chat_message(message["role"], avatar=avatar):
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shown_message = message["content"].replace("\n", " \n")\
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.replace("<", "\\<")\
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.replace(">", "\\>")
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if "```" in shown_message:
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# Replace " \n" with "\n" within code blocks
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shown_message = re.sub(code_block_pattern, normalize_code_block, shown_message, flags=re.DOTALL)
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if "`" in shown_message:
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shown_message = re.sub(inline_pattern, normalize_inline, shown_message)
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st.markdown(shown_message)
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col1, col2, col3, col4 = st.columns([1, 1, 1, 1])
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with col1:
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if st.button("Edit", key=f"edit_{i}_{len(st.session_state.messages)}"):
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st.session_state.edit_index = i
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st.rerun()
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with col2:
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if st.session_state.is_delete_mode and st.button("Delete", key=f"delete_{i}_{len(st.session_state.messages)}"):
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del st.session_state.messages[i]
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st.rerun()
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with col3:
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text_to_copy = message["content"]
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# Encode the string to escape
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text_to_copy_escaped = urllib.parse.quote(text_to_copy)
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copy_button_html = f"""
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<button id="copy-msg-btn-{i}" style='font-size: 1em; padding: 0.5em;' onclick='copyMessage("{i}")'>Copy</button>
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<script>
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function copyMessage(index) {{
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navigator.clipboard.writeText(decodeURIComponent("{text_to_copy_escaped}"));
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let copyBtn = document.getElementById("copy-msg-btn-" + index);
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copyBtn.innerHTML = "Copied!";
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setTimeout(function(){{ copyBtn.innerHTML = "Copy"; }}, 2000);
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}}
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</script>
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"""
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html(copy_button_html, height=50)
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if i == len(st.session_state.messages) - 1 and message["role"] == "CHATBOT":
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with col4:
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if st.button("Retry", key=f"retry_{i}_{len(st.session_state.messages)}"):
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if len(st.session_state.messages) >= 2:
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del st.session_state.messages[-1]
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st.session_state.retry_flag = True
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st.rerun()
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if "edit_index" in st.session_state and st.session_state.edit_index == i:
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with st.form(key=f"edit_form_{i}_{len(st.session_state.messages)}"):
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new_content = st.text_area("Edit message", height=200, value=st.session_state.messages[i]["content"])
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col1, col2 = st.columns([1, 1])
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with col1:
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if st.form_submit_button("Save"):
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st.session_state.messages[i]["content"] = new_content
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del st.session_state.edit_index
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st.rerun()
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with col2:
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if st.form_submit_button("Cancel"):
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del st.session_state.edit_index
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st.rerun()
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# Add sidebar for advanced settings
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with st.sidebar:
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settings_tab, appearance_tab = st.tabs(["Settings", "Appearance"])
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with settings_tab:
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st.markdown("Help (Japanese): https://rentry.org/9hgneofz")
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# Copy Conversation History button
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log_text = ""
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for message in st.session_state.messages:
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if message["role"] == "user":
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log_text += "<USER>\n"
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log_text += message["content"] + "\n\n"
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else:
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log_text += "<ASSISTANT>\n"
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log_text += message["content"] + "\n\n"
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log_text = log_text.rstrip("\n")
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# Encode the string to escape
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log_text_escaped = urllib.parse.quote(log_text)
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copy_log_button_html = f"""
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<button id="copy-log-btn" style='font-size: 1em; padding: 0.5em;' onclick='copyLog()'>Copy Conversation History</button>
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<script>
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function copyLog() {{
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navigator.clipboard.writeText(decodeURIComponent("{log_text_escaped}"));
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let copyBtn = document.getElementById("copy-log-btn");
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copyBtn.innerHTML = "Copied!";
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setTimeout(function(){{ copyBtn.innerHTML = "Copy Conversation History"; }}, 2000);
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}}
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</script>
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"""
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html(copy_log_button_html, height=50)
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if st.session_state.get("is_history_shown") != True:
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if st.button("Display History as Code Block"):
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st.session_state.is_history_shown = True
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st.rerun()
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else:
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if st.button("Hide History"):
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st.session_state.is_history_shown = False
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st.rerun()
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st.code(log_text)
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st.session_state.is_delete_mode = st.toggle("Enable Delete button")
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st.header("Advanced Settings")
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model = st.selectbox("Model", options=["nvidia/nemotron-4-340b-instruct"], index=0)
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system_prompt = st.text_area("System Prompt", height=200)
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temperature = st.slider("Temperature", min_value=0.0, max_value=1.0, value=0.3, step=0.1)
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top_p = st.slider("Top-P", min_value=0.01, max_value=1.00, value=1.00, step=0.01)
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max_tokens = st.slider("Max Tokens (Output)", min_value=1, max_value=1024, value=1024, step=1)
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st.header("Restore History")
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history_input = st.text_area("Paste conversation history:", height=200)
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if st.button("Restore History"):
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st.session_state.messages = []
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messages = re.split(r"^(<USER>|<ASSISTANT>)\n", history_input, flags=re.MULTILINE)
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role = None
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text = ""
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for message in messages:
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if message.strip() in ["<USER>", "<ASSISTANT>"]:
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if role and text:
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st.session_state.messages.append({"role": role, "content": text.strip()})
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text = ""
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role = "user" if message.strip() == "<USER>" else "assistant"
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else:
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text += message
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if role and text:
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st.session_state.messages.append({"role": role, "content": text.strip()})
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st.rerun()
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st.header("Clear History")
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if st.button("Clear Chat History"):
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st.session_state.messages = []
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st.rerun()
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st.header("Change API Key")
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new_api_key = st.text_input("Enter new API Key", type="password")
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if st.button("Update API Key"):
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if new_api_key and new_api_key.isascii():
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st.session_state.api_key = new_api_key
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client = openai.OpenAI(api_key=new_api_key)
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st.success("API Key updated successfully!")
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else:
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st.warning("Please enter a valid API Key.")
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with appearance_tab:
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st.header("Font Selection")
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font_options = {
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"Zen Maru Gothic": "Zen Maru Gothic",
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"Noto Sans JP": "Noto Sans JP",
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"Sawarabi Mincho": "Sawarabi Mincho"
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}
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selected_font = st.selectbox("Choose a font", ["Default"] + list(font_options.keys()))
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st.header("Change the font size")
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st.session_state.font_size = st.slider("Font size", min_value=16.0, max_value=50.0, value=16.0, step=1.0)
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st.header("Change the user's icon")
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st.session_state.user_avatar = st.file_uploader("Choose an image", type=["png", "jpg", "jpeg", "webp", "gif", "bmp", "svg",], key="user_avatar_uploader")
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st.header("Change the assistant's icon")
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st.session_state.assistant_avatar = st.file_uploader("Choose an image", type=["png", "jpg", "jpeg", "webp", "gif", "bmp", "svg",], key="assistant_avatar_uploader")
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st.header("Change the icon size")
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st.session_state.avatar_size = st.slider("Icon size", min_value=2.0, max_value=20.0, value=2.0, step=0.2)
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# After Stop generating
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if st.session_state.get("is_streaming"):
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st.session_state.messages.append({"role": "assistant", "content": st.session_state.response})
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st.session_state.is_streaming = False
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if "retry_flag" in st.session_state and st.session_state.retry_flag:
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st.session_state.retry_flag = False
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st.rerun()
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if selected_font != "Default":
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with open("style.css") as css:
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st.markdown(f'<style>{css.read()}</style>', unsafe_allow_html=True)
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st.markdown(f'<style>body * {{ font-family: "{font_options[selected_font]}", serif !important; }}</style>', unsafe_allow_html=True)
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# Change font size
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st.markdown(f'<style>[data-testid="stChatMessageContent"] .st-emotion-cache-cnbvxy p{{font-size: {st.session_state.font_size}px;}}</style>', unsafe_allow_html=True)
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# Change icon size
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# (CSS element names may be subject to change.)
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# (Contributor: ★31 >>538)
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AVATAR_SIZE_STYLE = f"""
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<style>
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[data-testid="chatAvatarIcon-user"] {{
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width: {st.session_state.avatar_size}rem;
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height: {st.session_state.avatar_size}rem;
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}}
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[data-testid="chatAvatarIcon-assistant"] {{
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width: {st.session_state.avatar_size}rem;
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height: {st.session_state.avatar_size}rem;
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}}
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[data-testid="stChatMessage"] .st-emotion-cache-1pbsqtx {{
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width: {st.session_state.avatar_size / 1.6}rem;
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height: {st.session_state.avatar_size / 1.6}rem;
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}}
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[data-testid="stChatMessage"] .st-emotion-cache-p4micv {{
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width: {st.session_state.avatar_size}rem;
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height: {st.session_state.avatar_size}rem;
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}}
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</style>
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"""
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st.markdown(AVATAR_SIZE_STYLE, unsafe_allow_html=True)
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display_messages()
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# After Retry
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if st.session_state.get("retry_flag"):
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if len(st.session_state.messages) > 0:
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prompt = st.session_state.messages[-1]["content"]
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messages = st.session_state.messages[:-1].copy()
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response = get_ai_response(prompt, messages)
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st.session_state.messages.append({"role": "assistant", "content": response})
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st.session_state.retry_flag = False
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st.rerun()
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else:
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st.session_state.retry_flag = False
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| 352 |
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if prompt := st.chat_input("Enter your message here..."):
|
| 353 |
-
chat_history = st.session_state.messages.copy()
|
| 354 |
-
|
| 355 |
-
shown_message = prompt.replace("\n", " \n")\
|
| 356 |
-
.replace("<", "\\<")\
|
| 357 |
-
.replace(">", "\\>")
|
| 358 |
-
|
| 359 |
-
with st.chat_message("user", avatar=st.session_state.user_avatar):
|
| 360 |
-
st.write(shown_message)
|
| 361 |
-
|
| 362 |
-
st.session_state.messages.append({"role": "user", "content": prompt})
|
| 363 |
-
|
| 364 |
-
response = get_ai_response(prompt, chat_history)
|
| 365 |
-
|
| 366 |
-
st.session_state.messages.append({"role": "assistant", "content": response})
|
| 367 |
-
st.rerun()
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