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Merge pull request #276 from theobjectivedad/logging_enhancement

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Logging update: added PID and formatting
This commit is contained in:
Wing Lian
2023-07-16 17:04:52 -04:00
committed by GitHub
parent 0bd09c077d b1f4f7a34d
commit 6f16c4569d
14 changed files with 124 additions and 79 deletions
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3
scripts/alpaca_json_to_jsonl.py
View File

@@ -15,6 +15,9 @@ from axolotl.convert import (
JsonToJsonlConverter,
StdoutWriter,
)
from axolotl.logging_config import configure_logging
configure_logging()
# add src to the pythonpath so we don't need to pip install this
project_root = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))

31
scripts/finetune.py
View File

@@ -17,6 +17,7 @@ import yaml
from optimum.bettertransformer import BetterTransformer
from transformers import GenerationConfig, TextStreamer
from axolotl.logging_config import configure_logging
from axolotl.utils.data import load_prepare_datasets, load_pretraining_dataset
from axolotl.utils.dict import DictDefault
from axolotl.utils.models import load_model, load_tokenizer
@@ -29,8 +30,10 @@ project_root = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
src_dir = os.path.join(project_root, "src")
sys.path.insert(0, src_dir)
configure_logging()
LOG = logging.getLogger("axolotl.scripts")
logging.basicConfig(level=os.getenv("LOG_LEVEL", "INFO"))
DEFAULT_DATASET_PREPARED_PATH = "last_run_prepared"
@@ -212,7 +215,7 @@ def train(
# load the tokenizer first
tokenizer_config = cfg.tokenizer_config or cfg.base_model_config
logging.info(f"loading tokenizer... {tokenizer_config}")
LOG.info(f"loading tokenizer... {tokenizer_config}")
tokenizer = load_tokenizer(tokenizer_config, cfg.tokenizer_type, cfg)
if (
@@ -234,7 +237,7 @@ def train(
eval_dataset = None
if cfg.debug or "debug" in kwargs:
logging.info("check_dataset_labels...")
LOG.info("check_dataset_labels...")
check_dataset_labels(
train_dataset.select(
[random.randrange(0, len(train_dataset) - 1) for _ in range(5)] # nosec
@@ -243,11 +246,11 @@ def train(
)
if prepare_ds_only:
logging.info("Finished preparing dataset. Exiting...")
LOG.info("Finished preparing dataset. Exiting...")
return
# Load the model and tokenizer
logging.info("loading model and peft_config...")
LOG.info("loading model and peft_config...")
model, peft_config = load_model(
cfg.base_model,
cfg.base_model_config,
@@ -258,17 +261,17 @@ def train(
)
if "merge_lora" in kwargs and cfg.adapter is not None:
logging.info("running merge of LoRA with base model")
LOG.info("running merge of LoRA with base model")
model = model.merge_and_unload()
model.to(dtype=torch.float16)
if cfg.local_rank == 0:
logging.info("saving merged model")
LOG.info("saving merged model")
model.save_pretrained(str(Path(cfg.output_dir) / "merged"))
return
if cfg.inference:
logging.info("calling do_inference function")
LOG.info("calling do_inference function")
prompter: Optional[str] = "AlpacaPrompter"
if "prompter" in kwargs:
if kwargs["prompter"] == "None":
@@ -287,12 +290,12 @@ def train(
model.config.use_cache = False
if torch.__version__ >= "2" and sys.platform != "win32":
logging.info("Compiling torch model")
LOG.info("Compiling torch model")
model = torch.compile(model)
# go ahead and presave, so we have the adapter config available to inspect
if peft_config:
logging.info(f"Pre-saving adapter config to {cfg.output_dir}")
LOG.info(f"Pre-saving adapter config to {cfg.output_dir}")
peft_config.save_pretrained(cfg.output_dir)
# In case we want to stop early with ctrl+c, this is a nice to have to save the pretrained model
@@ -308,9 +311,9 @@ def train(
signal.SIGINT, lambda signum, frame: terminate_handler(signum, frame, model)
)
logging.info("Starting trainer...")
LOG.info("Starting trainer...")
if cfg.group_by_length:
logging.info("hang tight... sorting dataset for group_by_length")
LOG.info("hang tight... sorting dataset for group_by_length")
resume_from_checkpoint = cfg.resume_from_checkpoint
if cfg.resume_from_checkpoint is None and cfg.auto_resume_from_checkpoints:
possible_checkpoints = [
@@ -322,7 +325,7 @@ def train(
key=lambda path: int(path.split("-")[-1]),
)
resume_from_checkpoint = sorted_paths[-1]
logging.info(
LOG.info(
f"Using Auto-resume functionality to start with checkpoint at {resume_from_checkpoint}"
)
@@ -336,7 +339,7 @@ def train(
else:
trainer.train(resume_from_checkpoint=resume_from_checkpoint)
logging.info(f"Training Completed!!! Saving pre-trained model to {cfg.output_dir}")
LOG.info(f"Training Completed!!! Saving pre-trained model to {cfg.output_dir}")
# TODO do we need this fix? https://huggingface.co/docs/accelerate/usage_guides/fsdp#saving-and-loading
# only save on rank 0, otherwise it corrupts output on multi-GPU when multiple processes attempt to write the same file

4
src/axolotl/datasets.py
View File

@@ -14,6 +14,8 @@ from .prompt_tokenizers import InvalidDataException, PromptTokenizingStrategy
# let's check to ensure we don't truncate an item in the middle, we'll use
# the collators later on to pad the datasets
LOG = logging.getLogger("axolotl")
class TokenizedPromptDataset(IterableDataset):
"""
@@ -115,7 +117,7 @@ class ConstantLengthDataset(IterableDataset):
"attention_mask": attention_mask,
}
else:
logging.warning(
LOG.warning(
f"dropping batch due to tensor size mismatch input_ids: {input_ids.size()}, labels: {labels.size()}, attention_mask: {attention_mask.size()}"
)
buffer = {

30
src/axolotl/logging_config.py Normal file
View File

@@ -0,0 +1,30 @@
"""Logging configuration settings"""
import os
import sys
from logging.config import dictConfig
from typing import Any, Dict
DEFAULT_LOGGING_CONFIG: Dict[str, Any] = {
"version": 1,
"formatters": {
"simple": {
"format": "[%(asctime)s] [%(levelname)s] [%(name)s.%(funcName)s:%(lineno)d] [PID:%(process)d] %(message)s",
},
},
"filters": {},
"handlers": {
"console": {
"class": "logging.StreamHandler",
"formatter": "simple",
"filters": [],
"stream": sys.stdout,
},
},
"root": {"handlers": ["console"], "level": os.getenv("LOG_LEVEL", "INFO")},
}
def configure_logging():
"""Configure with default logging"""
dictConfig(DEFAULT_LOGGING_CONFIG)

4
src/axolotl/monkeypatch/llama_landmark_attn.py
View File

@@ -53,7 +53,7 @@ from transformers.utils import (
replace_return_docstrings,
)
logger = logging.get_logger(__name__)
LOG = logging.getLogger("axolotl")
_CONFIG_FOR_DOC = "LlamaConfig"
@@ -862,7 +862,7 @@ class LlamaModel(LlamaPreTrainedModel):
if self.gradient_checkpointing and self.training:
if use_cache:
logger.warning_once(
LOG.warning_once(
"`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`..."
)
use_cache = False

4
src/axolotl/prompt_strategies/pygmalion.py
View File

@@ -11,6 +11,8 @@ from axolotl.prompt_tokenizers import (
tokenize_prompt_default,
)
LOG = logging.getLogger("axolotl")
IGNORE_TOKEN_ID = -100
@@ -64,7 +66,7 @@ class PygmalionPromptTokenizingStrategy(PromptTokenizingStrategy):
*copy.deepcopy(res["input_ids"])
][len(self.bot_prefix_token_ids) :]
else:
logging.warning(f"unknown role in conversation: {role}")
LOG.warning(f"unknown role in conversation: {role}")
res = defaultdict(lambda: [])
# pylint: disable=duplicate-code

4
src/axolotl/prompt_tokenizers.py
View File

@@ -10,6 +10,8 @@ from transformers import PreTrainedTokenizer
from axolotl.prompters import IGNORE_TOKEN_ID
LOG = logging.getLogger("axolotl")
IGNORE_INDEX = -100
LLAMA_DEFAULT_PAD_TOKEN = "[PAD]" # nosec
LLAMA_DEFAULT_EOS_TOKEN = "</s>" # nosec
@@ -384,7 +386,7 @@ class ShareGPTPromptTokenizingStrategy(PromptTokenizingStrategy):
# everything from this is masked out from the labels
labels = [IGNORE_TOKEN_ID] * len(res["input_ids"])
else:
logging.warning(f"unhandled role: {part[0]}")
LOG.warning(f"unhandled role: {part[0]}")
# pylint: disable=duplicate-code
result, current_len = parse_tokenized_to_result(

3
src/axolotl/prompters.py
View File

@@ -5,6 +5,7 @@ import logging
from enum import Enum, auto
from typing import Generator, List, Optional, Tuple, Union
LOG = logging.getLogger("axolotl")
IGNORE_TOKEN_ID = -100
@@ -241,7 +242,7 @@ class Conversation:
if message:
yield (role + ":", " " + message)
else:
logging.warning(f"role with empty message: {role}")
LOG.warning(f"role with empty message: {role}")
yield (role + ":", "")
def copy(self):

44
src/axolotl/utils/data.py
View File

@@ -35,6 +35,8 @@ from axolotl.prompters import (
SummarizeTLDRPrompter,
)
LOG = logging.getLogger("axolotl")
def load_tokenized_prepared_datasets(
tokenizer, cfg, default_dataset_prepared_path
@@ -73,17 +75,17 @@ def load_tokenized_prepared_datasets(
if dataset:
...
elif any(prepared_ds_path.glob("*")):
logging.info(f"Loading prepared dataset from disk at {prepared_ds_path}...")
LOG.info(f"Loading prepared dataset from disk at {prepared_ds_path}...")
dataset = load_from_disk(str(prepared_ds_path))
logging.info("Prepared dataset loaded from disk...")
LOG.info("Prepared dataset loaded from disk...")
else:
logging.info(f"Unable to find prepared dataset in {prepared_ds_path}")
logging.info("Loading raw datasets...")
LOG.info(f"Unable to find prepared dataset in {prepared_ds_path}")
LOG.info("Loading raw datasets...")
if cfg.seed:
seed = cfg.seed
else:
logging.info("No seed provided, using default seed of 42")
LOG.info("No seed provided, using default seed of 42")
seed = 42
datasets = []
@@ -255,25 +257,21 @@ def load_tokenized_prepared_datasets(
suffix = ""
if ":load_" in d.type:
suffix = f" Did you mean {d.type.replace(':load_', '.load_')}?"
logging.error(
f"unhandled prompt tokenization strategy: {d.type}. {suffix}"
)
LOG.error(f"unhandled prompt tokenization strategy: {d.type}. {suffix}")
raise ValueError(
f"unhandled prompt tokenization strategy: {d.type} {suffix}"
)
logging.info("tokenizing, merging, and shuffling master dataset")
LOG.info("tokenizing, merging, and shuffling master dataset")
samples: List[int] = []
for d in datasets:
samples = samples + list(d)
dataset = Dataset.from_list(samples).shuffle(seed=seed)
if cfg.local_rank == 0:
logging.info(
f"Saving merged prepared dataset to disk... {prepared_ds_path}"
)
LOG.info(f"Saving merged prepared dataset to disk... {prepared_ds_path}")
dataset.save_to_disk(prepared_ds_path)
if cfg.push_dataset_to_hub:
logging.info(
LOG.info(
f"Saving merged prepared dataset with push_to_hub... {cfg.push_dataset_to_hub}/{ds_hash}"
)
dataset.push_to_hub(
@@ -324,7 +322,7 @@ def load_prepare_datasets(
use_auth_token = cfg.hf_use_auth_token
try:
if cfg.push_dataset_to_hub:
logging.info(
LOG.info(
f"Checking for packed prepared dataset from hub... {cfg.push_dataset_to_hub}/{ds_hash}"
)
dataset = load_dataset(
@@ -338,13 +336,13 @@ def load_prepare_datasets(
if dataset:
...
elif any(prepared_ds_path.glob("*")):
logging.info(
LOG.info(
f"Loading prepared packed dataset from disk at {prepared_ds_path}..."
)
dataset = load_from_disk(str(prepared_ds_path))
logging.info("Prepared packed dataset loaded from disk...")
LOG.info("Prepared packed dataset loaded from disk...")
if cfg.push_dataset_to_hub:
logging.info(
LOG.info(
f"Saving packed prepared dataset with push_to_hub... {cfg.push_dataset_to_hub}/{ds_hash}"
)
dataset.push_to_hub(
@@ -363,9 +361,7 @@ def load_prepare_datasets(
[dataset],
seq_length=max_packed_sequence_len,
)
logging.info(
f"packing master dataset to len: {cfg.max_packed_sequence_len}"
)
LOG.info(f"packing master dataset to len: {cfg.max_packed_sequence_len}")
dataset = Dataset.from_list(list(constant_len_dataset))
# filter out bad data
@@ -381,12 +377,12 @@ def load_prepare_datasets(
)
if cfg.local_rank == 0:
logging.info(
LOG.info(
f"Saving packed prepared dataset to disk... {prepared_ds_path}"
)
dataset.save_to_disk(prepared_ds_path)
if cfg.push_dataset_to_hub:
logging.info(
LOG.info(
f"Saving packed prepared dataset with push_to_hub... {cfg.push_dataset_to_hub}/{ds_hash}"
)
dataset.push_to_hub(
@@ -399,7 +395,7 @@ def load_prepare_datasets(
)
if cfg.dataset_shard_num and cfg.dataset_shard_idx is not None:
logging.info(
LOG.info(
f"Using index #{cfg.dataset_shard_idx} of {cfg.dataset_shard_num} shards"
)
dataset = dataset.shard(
@@ -520,7 +516,7 @@ def encode_pretraining(tokenizer, max_tokens, examples):
"attention_mask": [seq.tolist() for seq in new_attention_mask],
}
logging.debug(len(ret["input_ids"]))
LOG.debug(len(ret["input_ids"]))
return ret

44
src/axolotl/utils/models.py
View File

@@ -23,6 +23,8 @@ from transformers import ( # noqa: F401
from axolotl.prompt_tokenizers import LLAMA_DEFAULT_PAD_TOKEN
LOG = logging.getLogger("axolotl")
if TYPE_CHECKING:
from peft import PeftConfig # noqa: F401
@@ -50,10 +52,10 @@ def load_tokenizer(
use_fast=use_fast,
)
logging.debug(f"EOS: {tokenizer.eos_token_id} / {tokenizer.eos_token}")
logging.debug(f"BOS: {tokenizer.bos_token_id} / {tokenizer.bos_token}")
logging.debug(f"PAD: {tokenizer.pad_token_id} / {tokenizer.pad_token}")
logging.debug(f"UNK: {tokenizer.unk_token_id} / {tokenizer.unk_token}")
LOG.debug(f"EOS: {tokenizer.eos_token_id} / {tokenizer.eos_token}")
LOG.debug(f"BOS: {tokenizer.bos_token_id} / {tokenizer.bos_token}")
LOG.debug(f"PAD: {tokenizer.pad_token_id} / {tokenizer.pad_token}")
LOG.debug(f"UNK: {tokenizer.unk_token_id} / {tokenizer.unk_token}")
if tokenizer.__class__.__name__ in [
"LlamaTokenizer",
@@ -92,21 +94,21 @@ def load_model(
if cfg.device not in ["mps", "cpu"] and not cfg.inference:
from axolotl.flash_attn import replace_llama_attn_with_flash_attn
logging.info("patching with flash attention")
LOG.info("patching with flash attention")
replace_llama_attn_with_flash_attn()
elif cfg.is_llama_derived_model and cfg.xformers_attention:
from axolotl.monkeypatch.llama_attn_hijack_xformers import (
hijack_llama_attention,
)
logging.info("patching with xformers attention")
LOG.info("patching with xformers attention")
hijack_llama_attention()
elif cfg.is_llama_derived_model and cfg.sdp_attention:
from axolotl.monkeypatch.llama_attn_hijack_xformers import (
hijack_llama_sdp_attention,
)
logging.info("patching with sdp attention")
LOG.info("patching with sdp attention")
hijack_llama_sdp_attention()
elif cfg.is_llama_derived_model and cfg.landmark_attention:
from axolotl.monkeypatch.llama_landmark_attn import (
@@ -114,7 +116,7 @@ def load_model(
patch_llama_with_landmark_attn,
)
logging.info("patching with landmark attention")
LOG.info("patching with landmark attention")
patch_llama_with_landmark_attn()
# Note: This might overwrite previous additional_special_tokens
@@ -125,7 +127,7 @@ def load_model(
replace_llama_rope_with_xpos_rope,
)
logging.info("patching with xpos rope")
LOG.info("patching with xpos rope")
replace_llama_rope_with_xpos_rope()
if cfg.bf16 or cfg.bfloat16:
@@ -142,7 +144,7 @@ def load_model(
replace_peft_model_with_int4_lora_model()
except Exception as err:
logging.exception(err)
LOG.exception(err)
raise err
try:
@@ -187,7 +189,7 @@ def load_model(
if len(files) > 0:
model_path = str(files[0])
else:
logging.warning(
LOG.warning(
"unable to find a cached model file, this will likely fail..."
)
model_path = str(cache_model_path)
@@ -266,14 +268,14 @@ def load_model(
and cfg.sequence_len > config.max_seq_len
):
config.max_seq_len = cfg.sequence_len
logging.warning(f"increasing context length to {cfg.sequence_len}")
LOG.warning(f"increasing context length to {cfg.sequence_len}")
elif (
hasattr(config, "max_sequence_length")
and config.max_sequence_length
and cfg.sequence_len > config.max_sequence_length
):
config.max_sequence_length = cfg.sequence_len
logging.warning(f"increasing context length to {cfg.sequence_len}")
LOG.warning(f"increasing context length to {cfg.sequence_len}")
model = AutoModelForCausalLM.from_pretrained(
base_model,
config=config,
@@ -285,10 +287,10 @@ def load_model(
**model_kwargs,
)
except Exception as err: # pylint: disable=broad-exception-caught
logging.error(
LOG.error(
"Exception raised attempting to load model, retrying with AutoModelForCausalLM"
)
logging.exception(err)
LOG.exception(err)
model = AutoModelForCausalLM.from_pretrained(
base_model,
load_in_8bit=cfg.load_in_8bit and cfg.adapter is not None,
@@ -307,7 +309,7 @@ def load_model(
and model.config.max_position_embeddings
and cfg.sequence_len >= model.config.max_position_embeddings
):
logging.warning(
LOG.warning(
f"increasing model.config.max_position_embeddings to {cfg.sequence_len}"
)
model.config.max_position_embeddings = cfg.sequence_len
@@ -316,7 +318,7 @@ def load_model(
(cfg.adapter == "lora" and load_in_8bit)
or (cfg.adapter == "qlora" and cfg.load_in_4bit)
):
logging.info("converting PEFT model w/ prepare_model_for_kbit_training")
LOG.info("converting PEFT model w/ prepare_model_for_kbit_training")
model = prepare_model_for_kbit_training(
model, use_gradient_checkpointing=cfg.gradient_checkpointing
)
@@ -328,7 +330,7 @@ def load_model(
if cfg.gptq:
# Scales to half
logging.info("Fitting 4bit scales and zeros to half")
LOG.info("Fitting 4bit scales and zeros to half")
for _, module in model.named_modules():
if "Autograd4bitQuantLinear" in str(type(module)) or "Linear4bitLt" in str(
type(module)
@@ -354,7 +356,7 @@ def load_model(
if param.requires_grad:
requires_grad.append(f"{name}: {param.requires_grad}")
if len(requires_grad) == 0:
logging.warning("there are no parameters that require gradient updates")
LOG.warning("there are no parameters that require gradient updates")
model.config.use_cache = False
if cfg.flash_optimum:
@@ -388,7 +390,7 @@ def load_llama_adapter(model, cfg):
)
if cfg.lora_model_dir:
logging.info("Loading pretained LORA")
LOG.info("Loading pretained LORA")
model = PeftModel.from_pretrained(
model,
cfg.lora_model_dir,
@@ -435,7 +437,7 @@ def load_lora(model, cfg):
bits = 8
linear_names = find_all_linear_names(bits, model)
logging.info(f"found linear modules: {repr(linear_names)}")
LOG.info(f"found linear modules: {repr(linear_names)}")
lora_target_modules = list(set(lora_target_modules + linear_names))
lora_config = LoraConfig(

6
src/axolotl/utils/tokenization.py
View File

@@ -5,6 +5,8 @@ import logging
from termcolor import colored
LOG = logging.getLogger("axolotl")
def check_dataset_labels(dataset, tokenizer):
# the dataset is already shuffled, so let's just check the first 5 elements
@@ -32,7 +34,7 @@ def check_example_labels(example, tokenizer):
)
colored_tokens.append(colored_token)
logging.info(" ".join(colored_tokens))
logging.info("\n\n\n")
LOG.info(" ".join(colored_tokens))
LOG.info("\n\n\n")
return " ".join(colored_tokens)

4
src/axolotl/utils/trainer.py
View File

@@ -26,6 +26,8 @@ from axolotl.utils.schedulers import (
get_cosine_schedule_with_quadratic_warmup,
)
LOG = logging.getLogger("axolotl")
class AxolotlTrainingArguments(TrainingArguments):
"""
@@ -324,7 +326,7 @@ def setup_trainer(cfg, train_dataset, eval_dataset, model, tokenizer):
set_model_mem_id(model, tokenizer)
logging.info("Adding landmark attention tokens to dataset")
LOG.info("Adding landmark attention tokens to dataset")
for dataset in [train_dataset, eval_dataset]:
dataset = dataset.map(

20
src/axolotl/utils/validation.py
View File

@@ -4,6 +4,8 @@ import logging
import torch
LOG = logging.getLogger("axolotl")
def validate_config(cfg):
if cfg.gradient_accumulation_steps and cfg.batch_size:
@@ -11,7 +13,7 @@ def validate_config(cfg):
"please set only one of gradient_accumulation_steps or batch_size"
)
if cfg.batch_size:
logging.warning(
LOG.warning(
"%s\n%s",
"batch_size is not recommended. Please use gradient_accumulation_steps instead.",
"To calculate the equivalent gradient_accumulation_steps, divide batch_size / micro_batch_size / number of gpus.",
@@ -44,10 +46,10 @@ def validate_config(cfg):
raise ValueError("Require cfg.load_in_4bit to be True for qlora")
if not cfg.load_in_8bit and cfg.adapter == "lora":
logging.warning("We recommend setting `load_in_8bit: true` for LORA finetuning")
LOG.warning("We recommend setting `load_in_8bit: true` for LORA finetuning")
if cfg.trust_remote_code:
logging.warning(
LOG.warning(
"`trust_remote_code` is set to true. Please make sure that you reviewed the remote code/model."
)
@@ -66,31 +68,29 @@ def validate_config(cfg):
if cfg.flash_optimum is True:
if cfg.adapter:
logging.warning(
"BetterTransformers probably doesn't work with PEFT adapters"
)
LOG.warning("BetterTransformers probably doesn't work with PEFT adapters")
if cfg.fp16 or cfg.bf16:
raise ValueError("AMP is not supported with BetterTransformer")
if cfg.float16 is not True and cfg.bloat16 is not True:
logging.warning(
LOG.warning(
"You should probably set bfloat16 or float16 to true to "
"load the model in float16 for BetterTransformers"
)
if int(torch.__version__.split(".")[0]) < 2:
logging.warning("torch>=2.0.0 required")
LOG.warning("torch>=2.0.0 required")
raise ValueError(
f"flash_optimum for BetterTransformers may not be used with {torch.__version__}"
)
if cfg.pretraining_dataset and cfg.group_by_length:
logging.warning(
LOG.warning(
"You probably want to disable group_by_length as it will force a streamed dataset to download completely."
)
if any([cfg.adam_beta1, cfg.adam_beta2, cfg.adam_epsilon]) and (
not cfg.optimizer or "adamw" not in cfg.optimizer
):
logging.warning("adamw hyperparameters found, but no adamw optimizer set")
LOG.warning("adamw hyperparameters found, but no adamw optimizer set")
if cfg.push_to_hub_model_id:
raise ValueError(

2
tests/test_prompt_tokenizers.py
View File

@@ -17,7 +17,7 @@ from axolotl.prompt_tokenizers import (
)
from axolotl.prompters import AlpacaPrompter, PromptStyle, ShareGPTPrompter
logging.basicConfig(level="INFO")
LOG = logging.getLogger("axolotl")
class TestPromptTokenizationStrategies(unittest.TestCase):