kerasのmodel.summary()と似たようなことをpytorchのモデルで行ってくれるライブラリとして、torchinfoがある。
GitHub - TylerYep/torchinfo: View model summaries in PyTorch!
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llama2がどんな構造でパラメータ数なのか気になったのでtorchinfoを使ってみた所、表題のエラー。
elyza/ELYZA-japanese-Llama-2-7b · Hugging Face
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huggingface.co
from transformers import AutoModelForCausalLM
from torchinfo import summary
model_name = "elyza/ELYZA-japanese-Llama-2-7b"
model = AutoModelForCausalLM.from_pretrained(model_name)
batch_size = 1
max_len = 8
input_size = (batch_size, max_len)
summary(model, input_size=input_size)
RuntimeError: Failed to run torchinfo. See above stack traces for more details. Executed layers up to: []スタックトレースを見ろと書いてあるので、エラーログを遡ってみるとヒントを発見。
RuntimeError: Expected tensor for argument #1 'indices' to have one of the following scalar types: Long, Int; but got torch.FloatTensor instead (while checking arguments for embedding)モデルにはlongかintを入力しなければならないのに、floatが入力されたのでエラーが出た様子。
summaryでdtypeを指定できないか、引数を見てみる。
def summary(
model: nn.Module,
input_size: INPUT_SIZE_TYPE | None = None,
input_data: INPUT_DATA_TYPE | None = None,
batch_dim: int | None = None,
cache_forward_pass: bool | None = None,
col_names: Iterable[str] | None = None,
col_width: int = 25,
depth: int = 3,
device: torch.device | str | None = None,
dtypes: list[torch.dtype] | None = None,
mode: str | None = None,
row_settings: Iterable[str] | None = None,
verbose: int | None = None,
**kwargs: Any,
) -> ModelStatistics:
Args:
（中略）
dtypes (List[torch.dtype]):
If you use input_size, torchinfo assumes your input uses FloatTensors.
If your model use a different data type, specify that dtype.
For multiple inputs, specify the size of both inputs, and
also specify the types of each parameter here.
Default: NonedtypesはデフォルトだとFloatTensorsになっている。
画像や時系列はfloatを入力することが多いからだろうか？
LLMのトークンはintなので、dtypesを明示的に指定して再実行すれば良さそう。
torchの整数型には、int8, int16, int32, int64がある。
Tensor Attributes — PyTorch 2.5 documentation
pytorch.org
スタックトレースのログによるとlongかintにすればいいみたいなので、torch.intかtorch.longを指定すればいい。
今回はtorch.intで実行してみた。
summary(model, input_size=input_size, dtypes=[torch.int])=========================================================================================================
Layer (type:depth-idx) Output Shape Param #
=========================================================================================================
LlamaForCausalLM [1, 32, 8, 128] --
├─LlamaModel: 1-1 [1, 32, 8, 128] --
│ └─Embedding: 2-1 [1, 8, 4096] 131,072,000
│ └─ModuleList: 2-2 -- --
│ │ └─LlamaDecoderLayer: 3-1 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-2 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-3 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-4 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-5 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-6 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-7 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-8 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-9 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-10 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-11 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-12 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-13 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-14 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-15 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-16 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-17 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-18 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-19 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-20 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-21 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-22 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-23 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-24 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-25 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-26 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-27 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-28 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-29 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-30 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-31 [1, 8, 4096] 202,383,360
│ │ └─LlamaDecoderLayer: 3-32 [1, 8, 4096] 202,383,360
│ └─LlamaRMSNorm: 2-3 [1, 8, 4096] 4,096
├─Linear: 1-2 [1, 8, 32000] 131,072,000
=========================================================================================================
Total params: 6,738,415,616
Trainable params: 6,738,415,616
Non-trainable params: 0
Total mult-adds (G): 6.74
=========================================================================================================
Input size (MB): 0.00
Forward/backward pass size (MB): 106.38
Params size (MB): 26953.66
Estimated Total Size (MB): 27060.04
=========================================================================================================無事にモデルの情報が出力された。
デコーダーが32層あり、num_hidden_layers=32と一致していた。
パラメータ数は67億で、確かに7Bだった。
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