[Question]: cannot import name 'BeforeValidator' from 'pydantic' - pydantic version used in llama-index?

[jingweibhuang]

Question Validation

• I have searched both the documentation and discord for an answer.

Question

Hello,
I got the following import error when importing as follows:

from llama_index.core import VectorStoreIndex, SimpleDirectoryReader

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ImportError Traceback (most recent call last)
Cell In[1], line 1
----> 1 from llama_index.core import VectorStoreIndex, SimpleDirectoryReader

File ~/pro/mambaforge/envs/env_cuda121c/lib/python3.10/site-packages/llama_index/core/init.py:16
13 pass
15 # response
---> 16 from llama_index.core.base.response.schema import Response
18 # import global eval handler
19 from llama_index.core.callbacks.global_handlers import set_global_handler

File ~/pro/mambaforge/envs/env_cuda121c/lib/python3.10/site-packages/llama_index/core/base/response/schema.py:7
4 from dataclasses import dataclass, field
5 from typing import Any, Dict, List, Optional, Union
----> 7 from llama_index.core.async_utils import asyncio_run
8 from llama_index.core.bridge.pydantic import BaseModel
9 from llama_index.core.schema import NodeWithScore

File ~/pro/mambaforge/envs/env_cuda121c/lib/python3.10/site-packages/llama_index/core/async_utils.py:7
4 from itertools import zip_longest
5 from typing import Any, Coroutine, Iterable, List, Optional, TypeVar
----> 7 import llama_index.core.instrumentation as instrument
9 dispatcher = instrument.get_dispatcher(name)
12 def asyncio_module(show_progress: bool = False) -> Any:

File ~/pro/mambaforge/envs/env_cuda121c/lib/python3.10/site-packages/llama_index/core/instrumentation/init.py:5
2 from abc import ABC
3 from typing import Any, List
----> 5 from llama_index.core.instrumentation.dispatcher import (
6 Dispatcher,
7 Manager,
8 DISPATCHER_SPAN_DECORATED_ATTR,
9 )
10 from llama_index.core.instrumentation.event_handlers import NullEventHandler
11 from llama_index.core.instrumentation.span_handlers import NullSpanHandler

File ~/pro/mambaforge/envs/env_cuda121c/lib/python3.10/site-packages/llama_index/core/instrumentation/dispatcher.py:10
8 import uuid
9 from deprecated import deprecated
---> 10 from llama_index.core.bridge.pydantic import BaseModel, Field, ConfigDict
11 from llama_index.core.instrumentation.event_handlers import BaseEventHandler
12 from llama_index.core.instrumentation.span import active_span_id

File ~/pro/mambaforge/envs/env_cuda121c/lib/python3.10/site-packages/llama_index/core/bridge/pydantic.py:2
1 import pydantic
----> 2 from pydantic import (
3 AnyUrl,
4 BaseModel,
5 BeforeValidator,
6 ConfigDict,
7 Field,
8 FilePath,
9 GetCoreSchemaHandler,
10 GetJsonSchemaHandler,
11 PlainSerializer,
12 PrivateAttr,
13 Secret,
14 SecretStr,
15 SerializeAsAny,
16 StrictFloat,
17 StrictInt,
18 StrictStr,
19 TypeAdapter,
20 ValidationError,
21 ValidationInfo,
22 WithJsonSchema,
23 WrapSerializer,
24 create_model,
25 field_serializer,
26 field_validator,
27 model_serializer,
28 model_validator,
29 )
30 from pydantic.fields import FieldInfo
31 from pydantic.json_schema import JsonSchemaValue

ImportError: cannot import name 'BeforeValidator' from 'pydantic' (/home2/xxx/.local/lib/python3.10/site-packages/pydantic/init.cpython-310-x86_64-linux-gnu.so)

I tried both pydantic 2.10 (newest version) and older 1.10. What version of pydantic is used in Llama-index, which is using BeforeValidator?

Thank you,

[dosubot]

@jingweibhuang Hello! I'm here to assist you with any bugs, questions, or contributions. Let's tackle this together!

The version of Pydantic used in Llama-index that requires the 'BeforeValidator' import is ">=2.8.0" ^[1].

To continue talking to Dosu, mention @dosu.

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[jingweibhuang]

@dosu Hi Dosu, Thanks a lot for quick response! Let me try 2.8 or 2.9. I already tried 2.10.
Thanks again,

[dosubot]

You're welcome! If you encounter any more issues or need further assistance, feel free to reach out. Good luck!

To continue talking to Dosu, mention @dosu.

---

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[logan-markewich]

@jingweibhuang what specific version of 2.10? I know 2.10.0 was initially very breaking. I hope there wasn't another breaking change...

[jingweibhuang]

Hi Logan,
Earlier I used mamba install llama-index, which installed pydantic 2.10.3 and led to the import error.
Just now I tried pip install llama-index, which installed 2.10.4 and works now:-)
Thanks!