Files
transformers/tests/utils/test_chat_template_utils.py
MattandClaude Opus 5.5 2a82760ede Alias thinking -> reasoning_content (#49535)
* Draft PR to fix thinking -> reasoning_content

* Cleanup

* More function simplification

* Add tests for reasoning field aliasing

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-20 11:46:22 +00:00

788 lines
25 KiB
Python

# Copyright 2024 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import copy
import unittest
from typing import Literal
from transformers.testing_utils import require_jinja
from transformers.utils import DocstringParsingException, TypeHintParsingException, get_json_schema
from transformers.utils.chat_template_utils import render_jinja_template
class JsonSchemaGeneratorTest(unittest.TestCase):
def test_simple_function(self):
def fn(x: int):
"""
Test function
Args:
x: The input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {"x": {"type": "integer", "description": "The input"}},
"required": ["x"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_no_arguments(self):
def fn():
"""
Test function
"""
return True
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {"type": "object", "properties": {}},
}
self.assertEqual(schema["function"], expected_schema)
def test_bare_container_types(self):
def fn(x: list, y: tuple, z: dict):
"""
Test function
Args:
x: The first input
y: The second input
z: The third input
"""
return x
# Bare builtin containers have no typing origin, so they must be mapped explicitly;
# they should match their `typing.List` / `typing.Tuple` / `typing.Dict` equivalents.
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {"type": "array", "description": "The first input"},
"y": {"type": "array", "description": "The second input"},
"z": {"type": "object", "description": "The third input"},
},
"required": ["x", "y", "z"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_union(self):
def fn(x: int | float):
"""
Test function
Args:
x: The input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {"x": {"type": ["integer", "number"], "description": "The input"}},
"required": ["x"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_union_with_duplicate_types(self):
def fn(x: list | tuple, y: list | tuple | dict | None = None):
"""
Test function
Args:
x: The first input
y: The second input
"""
return x
# `list` and `tuple` both map to "array", which should appear only once in the schema
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {"type": "array", "description": "The first input"},
"y": {"type": ["array", "object"], "nullable": True, "description": "The second input"},
},
"required": ["x"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_optional(self):
def fn(x: int | None):
"""
Test function
Args:
x: The input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {"x": {"type": "integer", "description": "The input", "nullable": True}},
"required": ["x"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_default_arg(self):
def fn(x: int = 42):
"""
Test function
Args:
x: The input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {"type": "object", "properties": {"x": {"type": "integer", "description": "The input"}}},
}
self.assertEqual(schema["function"], expected_schema)
def test_nested_list(self):
def fn(x: list[list[str | int]]):
"""
Test function
Args:
x: The input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {
"type": "array",
"items": {"type": "array", "items": {"type": ["integer", "string"]}},
"description": "The input",
}
},
"required": ["x"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_multiple_arguments(self):
def fn(x: int, y: str):
"""
Test function
Args:
x: The input
y: Also the input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {"type": "integer", "description": "The input"},
"y": {"type": "string", "description": "Also the input"},
},
"required": ["x", "y"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_multiple_complex_arguments(self):
def fn(x: list[int | float], y: int | str | None = None):
"""
Test function
Args:
x: The input
y: Also the input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {"type": "array", "items": {"type": ["integer", "number"]}, "description": "The input"},
"y": {
"type": ["integer", "string"],
"nullable": True,
"description": "Also the input",
},
},
"required": ["x"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_union_of_complex_types(self):
def fn(x: str | list[str], y: Literal["a", "b"] | int | None = None):
"""
Test function
Args:
x: The input
y: Also the input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {
"anyOf": [{"type": "string"}, {"type": "array", "items": {"type": "string"}}],
"description": "The input",
},
"y": {
"anyOf": [{"type": "string", "enum": ["a", "b"]}, {"type": "integer"}],
"nullable": True,
"description": "Also the input",
},
},
"required": ["x"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_missing_docstring(self):
def fn(x: int):
return x
with self.assertRaises(DocstringParsingException):
get_json_schema(fn)
def test_missing_param_docstring(self):
def fn(x: int):
"""
Test function
"""
return x
with self.assertRaises(DocstringParsingException):
get_json_schema(fn)
def test_missing_type_hint(self):
def fn(x):
"""
Test function
Args:
x: The input
"""
return x
with self.assertRaises(TypeHintParsingException):
get_json_schema(fn)
def test_return_value(self):
def fn(x: int) -> int:
"""
Test function
Args:
x: The input
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {"x": {"type": "integer", "description": "The input"}},
"required": ["x"],
},
"return": {"type": "integer"},
}
self.assertEqual(schema["function"], expected_schema)
def test_return_value_docstring(self):
def fn(x: int) -> int:
"""
Test function
Args:
x: The input
Returns:
The output
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {"x": {"type": "integer", "description": "The input"}},
"required": ["x"],
},
"return": {"type": "integer", "description": "The output"},
}
self.assertEqual(schema["function"], expected_schema)
def test_tuple(self):
def fn(x: tuple[int, str]):
"""
Test function
Args:
x: The input
Returns:
The output
"""
return x
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {
"type": "array",
"prefixItems": [{"type": "integer"}, {"type": "string"}],
"description": "The input",
}
},
"required": ["x"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_single_element_tuple_fails(self):
def fn(x: tuple[int]):
"""
Test function
Args:
x: The input
Returns:
The output
"""
return x
# Single-element tuples should just be the type itself, or List[type] for variable-length inputs
with self.assertRaises(TypeHintParsingException):
get_json_schema(fn)
def test_ellipsis_type_fails(self):
def fn(x: tuple[int, ...]):
"""
Test function
Args:
x: The input
Returns:
The output
"""
return x
# Variable length inputs should be specified with List[type], not Tuple[type, ...]
with self.assertRaises(TypeHintParsingException):
get_json_schema(fn)
def test_enum_extraction(self):
def fn(temperature_format: str):
"""
Test function
Args:
temperature_format: The temperature format to use (Choices: ["celsius", "fahrenheit"])
Returns:
The temperature
"""
return -40.0
# Let's see if that gets correctly parsed as an enum
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"temperature_format": {
"type": "string",
"enum": ["celsius", "fahrenheit"],
"description": "The temperature format to use",
}
},
"required": ["temperature_format"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_enum_extraction_non_string_choices(self):
def fn(rating: int, enabled: bool):
"""
Test function
Args:
rating: The rating to give (choices: [1, 2, 3])
enabled: Whether it is enabled (choices: [true, false])
"""
return -40.0
# Non-string choices (numbers, booleans) must be preserved as-is, not stripped as strings
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"rating": {
"type": "integer",
"enum": [1, 2, 3],
"description": "The rating to give",
},
"enabled": {
"type": "boolean",
"enum": [True, False],
"description": "Whether it is enabled",
},
},
"required": ["rating", "enabled"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_literal(self):
def fn(
temperature_format: Literal["celsius", "fahrenheit"],
booleanish: Literal[True, False, 0, 1, "y", "n"] = False,
):
"""
Test function
Args:
temperature_format: The temperature format to use
booleanish: A value that can be regarded as boolean
Returns:
The temperature
"""
return -40.0
# Let's see if that gets correctly parsed as an enum
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"temperature_format": {
"type": "string",
"enum": ["celsius", "fahrenheit"],
"description": "The temperature format to use",
},
"booleanish": {
"type": ["boolean", "integer", "string"],
"enum": [True, False, 0, 1, "y", "n"],
"description": "A value that can be regarded as boolean",
},
},
"required": ["temperature_format"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_multiline_docstring_with_types(self):
def fn(x: int, y: int):
"""
Test function
Args:
x: The first input
y: The second input. This is a longer description
that spans multiple lines with indentation and stuff.
Returns:
God knows what
"""
pass
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {"type": "integer", "description": "The first input"},
"y": {
"type": "integer",
"description": "The second input. This is a longer description that spans multiple lines with indentation and stuff.",
},
},
"required": ["x", "y"],
},
}
self.assertEqual(schema["function"], expected_schema)
def test_return_none(self):
def fn(x: int) -> None:
"""
Test function
Args:
x: The first input
"""
pass
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {
"x": {"type": "integer", "description": "The first input"},
},
"required": ["x"],
},
"return": {"type": "null"},
}
self.assertEqual(schema["function"], expected_schema)
def test_instance_method(self):
class Tool:
def fn(self, x: int):
"""
Test function
Args:
x: The input
"""
return x
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {"x": {"type": "integer", "description": "The input"}},
"required": ["x"],
},
}
self.assertEqual(get_json_schema(Tool.fn)["function"], expected_schema) # unbound case
self.assertEqual(get_json_schema(Tool().fn)["function"], expected_schema) # bound case
def test_static_method(self):
class Tool:
@staticmethod
def fn(x: int):
"""
Test function
Args:
x: The input
"""
return x
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {"x": {"type": "integer", "description": "The input"}},
"required": ["x"],
},
}
self.assertEqual(get_json_schema(Tool.fn)["function"], expected_schema)
self.assertEqual(get_json_schema(Tool().fn)["function"], expected_schema)
def test_class_method(self):
class Tool:
@classmethod
def fn(cls, x: int):
"""
Test function
Args:
x: The input
"""
return x
expected_schema = {
"name": "fn",
"description": "Test function",
"parameters": {
"type": "object",
"properties": {"x": {"type": "integer", "description": "The input"}},
"required": ["x"],
},
}
self.assertEqual(get_json_schema(Tool.fn)["function"], expected_schema)
self.assertEqual(get_json_schema(Tool().fn)["function"], expected_schema)
def test_everything_all_at_once(self):
def fn(x: str, y: list[str | int] | None, z: tuple[str | int, str] = (42, "hello")) -> tuple[int, str]:
"""
Test function with multiple args, and docstring args that we have to strip out.
Args:
x: The first input. It's got a big multiline
description and also contains
(choices: ["a", "b", "c"])
y: The second input. It's a big list with a single-line description.
z: The third input. It's some kind of tuple with a default arg.
Returns:
The output. The return description is also a big multiline
description that spans multiple lines.
"""
pass
schema = get_json_schema(fn)
expected_schema = {
"name": "fn",
"description": "Test function with multiple args, and docstring args that we have to strip out.",
"parameters": {
"type": "object",
"properties": {
"x": {
"type": "string",
"enum": ["a", "b", "c"],
"description": "The first input. It's got a big multiline description and also contains",
},
"y": {
"type": "array",
"items": {"type": ["integer", "string"]},
"nullable": True,
"description": "The second input. It's a big list with a single-line description.",
},
"z": {
"type": "array",
"prefixItems": [{"type": ["integer", "string"]}, {"type": "string"}],
"description": "The third input. It's some kind of tuple with a default arg.",
},
},
"required": ["x", "y"],
},
"return": {
"type": "array",
"prefixItems": [{"type": "integer"}, {"type": "string"}],
"description": "The output. The return description is also a big multiline\n description that spans multiple lines.",
},
}
self.assertEqual(schema["function"], expected_schema)
# Renders reasoning from the message field named FIELD
REASONING_TEMPLATE = """
{%- for message in messages %}
{{- "<|" + message.role + "|>\n" }}
{%- if message.FIELD is defined %}
{{- "<think>" + message.FIELD + "</think>\n" }}
{%- endif %}
{{- message.content + "<|end|>\n" }}
{%- endfor %}"""
@require_jinja
class ReasoningFieldAliasTest(unittest.TestCase):
def test_reasoning_renders_from_any_field_name(self):
expected = "<|user|>\nHi<|end|>\n<|assistant|>\n<think>Let me think</think>\nHello!<|end|>\n"
for template_field in ("reasoning_content", "thinking"):
for message_field in ("reasoning_content", "thinking", "reasoning"):
with self.subTest(template_field=template_field, message_field=message_field):
chat = [
{"role": "user", "content": "Hi"},
{"role": "assistant", message_field: "Let me think", "content": "Hello!"},
]
original_chat = copy.deepcopy(chat)
rendered, _ = render_jinja_template(
[chat], chat_template=REASONING_TEMPLATE.replace("FIELD", template_field)
)
self.assertEqual(rendered[0], expected)
# The aliases are added to copies of the messages, not to the caller's chat
self.assertEqual(chat, original_chat)
def test_continue_final_message_on_aliased_reasoning(self):
expected = "<|user|>\nHi<|end|>\n<|assistant|>\n<think>Let me think"
for template_field, message_field in (("thinking", "reasoning_content"), ("reasoning_content", "thinking")):
with self.subTest(template_field=template_field, message_field=message_field):
chat = [
{"role": "user", "content": "Hi"},
{"role": "assistant", message_field: "Let me think", "content": "Hello!"},
]
rendered, _ = render_jinja_template(
[chat],
chat_template=REASONING_TEMPLATE.replace("FIELD", template_field),
continue_final_message=message_field,
)
self.assertEqual(rendered[0], expected)