[Python] Add Deepseek-v3 conversation template (#3097)

This PR introduces the Deepseek-v3 conversation template.

Author: MasterJH5574

python/mlc_llm/conversation_template/__init__.py

@@ -9,7 +9,6 @@
 from . import (
     cohere,
     deepseek,
-    deepseek_v2,
     dolly,
     gemma,
     glm,

python/mlc_llm/conversation_template/deepseek.py

@@ -19,3 +19,33 @@
         stop_token_ids=[100001],
     )
 )
+
+# Deepseek V2
+ConvTemplateRegistry.register_conv_template(
+    Conversation(
+        name="deepseek_v2",
+        system_template=f"{MessagePlaceholders.SYSTEM.value}",
+        system_message="",
+        system_prefix_token_ids=[100000],
+        roles={"user": "User", "assistant": "Assistant"},
+        seps=["\n\n", "<｜end▁of▁sentence｜>"],
+        role_content_sep=": ",
+        role_empty_sep=":",
+        stop_str=["<｜end▁of▁sentence｜>"],
+        stop_token_ids=[100001],
+    )
+)
+
+# Deepseek V3
+ConvTemplateRegistry.register_conv_template(
+    Conversation(
+        name="deepseek_v3",
+        system_template=f"<｜begin▁of▁sentence｜>{MessagePlaceholders.SYSTEM.value}",
+        system_message="You are a helpful assistant.",
+        roles={"user": "<｜User｜>", "assistant": "<｜Assistant｜>"},
+        seps=["", "<｜end▁of▁sentence｜>"],
+        role_content_sep="",
+        role_empty_sep="",
+        stop_token_ids=[151643],
+    )
+)

python/mlc_llm/conversation_template/deepseek_v2.py

@@ -307,8 +307,9 @@ def gen_config(  # pylint: disable=too-many-locals,too-many-arguments,too-many-b
     "hermes3_llama-3_1",
     "tinyllama_v1_0",
     "aya-23",
-    "deepseek_v2",
     "deepseek",
+    "deepseek_v2",
+    "deepseek_v3",
     "olmo",
     "nemotron",
 }