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Current date for chat templates #3697

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Current date for chat templates #3697

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87fec6a
strftime_now
dkalinowski Oct 13, 2025
b3c2594
fix
dkalinowski Oct 16, 2025
322885d
fix
dkalinowski Oct 16, 2025
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7 changes: 7 additions & 0 deletions src/llm/servable_initializer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -164,6 +164,12 @@ void GenAiServableInitializer::loadPyTemplateProcessor(std::shared_ptr<GenAiServ

def raise_exception(message):
raise jinja2.exceptions.TemplateError(message)

# Appears in some of mistral chat templates and gpt-oss chat templates
def strftime_now(format):
import datetime as _dt
return _dt.datetime.now().strftime(fmt)

# Following the logic from:
# https://github.com/huggingface/transformers/blob/7188e2e28c6d663284634732564143b820a03f8b/src/transformers/utils/chat_template_utils.py#L398
class AssistantTracker(Extension):
Expand Down Expand Up @@ -228,6 +234,7 @@ void GenAiServableInitializer::loadPyTemplateProcessor(std::shared_ptr<GenAiServ
jinja_env = ImmutableSandboxedEnvironment(trim_blocks=True, lstrip_blocks=True, extensions=[AssistantTracker, jinja2.ext.loopcontrols], loader=template_loader)
jinja_env.policies["json.dumps_kwargs"]["ensure_ascii"] = False
jinja_env.globals["raise_exception"] = raise_exception
jinja_env.globals["strftime_now"] = strftime_now
jinja_env.filters["from_json"] = json.loads
if jinja_file.is_file():
template = jinja_env.get_template("chat_template.jinja")
Expand Down