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attention is all you need源码

时间: 2025-04-19 20:56:54 浏览: 26
### 关于 'Attention Is All You Need' 的源码实现 在探索《Attention Is All You Need》一文中提出的Transformer模型时,多个开源项目提供了该模型的具体实现。对于希望深入理解并实践这一开创性工作的研究者而言,TensorFlow 和 PyTorch 是两个广泛使用的框架。 #### TensorFlow 实现 一份详尽的基于 TensorFlow 的实现可以在 GitHub 上找到[^2]。此版本不仅包含了完整的 Transformer 架构,还附带了丰富的注释帮助读者更好地理解每一部分的功能。具体来说: - **编码器(Encoder)**: 编码输入序列中的信息; - **解码器(Decoder)**: 解析来自编码器的信息来生成目标序列; - **多头注意力机制(Multi-head Attention Mechanism)**: 提升模型捕捉不同位置间关系的能力; ```python import tensorflow as tf class MultiHeadAttention(tf.keras.layers.Layer): def __init__(self, d_model, num_heads): super(MultiHeadAttention, self).__init__() assert d_model % num_heads == 0 depth = d_model // num_heads self.wq = tf.keras.layers.Dense(d_model) self.wk = tf.keras.layers.Dense(d_model) self.wv = tf.keras.layers.Dense(d_model) self.dense = tf.keras.layers.Dense(d_model) def split_heads(self, x, batch_size): """Split the last dimension into (num_heads, depth).""" ... def call(self, v, k, q, mask=None): ... ``` 这段代码展示了如何构建一个多头自注意层,这是整个架构的核心组件之一。通过这种方式可以有效地提高模型性能,并允许更复杂的模式识别能力。 #### 输出层设计 最终,在完成所有必要的计算之后,输出层会应用 Softmax 函数以获得每个可能单词的概率分布,从而选出最有可能的结果作为预测值[^3]。 ```python def output_layer(logits): probabilities = tf.nn.softmax(logits, axis=-1) predictions = tf.argmax(probabilities, axis=-1) return predictions ``` 上述方法确保了即使面对大量候选词的情况下也能稳定地挑选出最佳选项。
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Connecting to objects.githubusercontent.com (objects.githubusercontent.com)|185.199.108.133|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 373960 (365K) [application/octet-stream] Saving to: ‘/content/libtcmalloc_minimal.so.4’ /content/libtcmallo 100%[===================>] 365.20K --.-KB/s in 0.02s 2025-07-10 10:19:01 (15.2 MB/s) - ‘/content/libtcmalloc_minimal.so.4’ saved [373960/373960] env: LD_PRELOAD=/content/libtcmalloc_minimal.so.4 libcairo2-dev is already the newest version (1.16.0-5ubuntu2). python3-dev is already the newest version (3.10.6-1~22.04.1). python3-dev set to manually installed. The following packages were automatically installed and are no longer required: libbz2-dev libpkgconf3 libreadline-dev Use 'apt autoremove' to remove them. The following packages will be REMOVED: pkgconf r-base-dev The following NEW packages will be installed: aria2 libaria2-0 libc-ares2 pkg-config 0 upgraded, 4 newly installed, 2 to remove and 41 not upgraded. Need to get 1,561 kB of archives. After this operation, 5,430 kB of additional disk space will be used. (Reading database ... 126281 files and directories currently installed.) Removing r-base-dev (4.5.1-1.2204.0) ... dpkg: pkgconf: dependency problems, but removing anyway as you requested: libsndfile1-dev:amd64 depends on pkg-config; however: Package pkg-config is not installed. Package pkgconf which provides pkg-config is to be removed. libopencv-dev depends on pkg-config; however: Package pkg-config is not installed. Package pkgconf which provides pkg-config is to be removed. libmkl-dev:amd64 depends on pkg-config; however: Package pkg-config is not installed. Package pkgconf which provides pkg-config is to be removed. libjack-dev depends on pkg-config; however: Package pkg-config is not installed. Package pkgconf which provides pkg-config is to be removed. libgphoto2-dev:amd64 depends on pkg-config; however: Package pkg-config is not installed. Package pkgconf which provides pkg-config is to be removed. libglib2.0-dev:amd64 depends on pkg-config; however: Package pkg-config is not installed. Package pkgconf which provides pkg-config is to be removed. libfontconfig-dev:amd64 depends on pkg-config; however: Package pkg-config is not installed. Package pkgconf which provides pkg-config is to be removed. Removing pkgconf (1.8.0-1) ... Removing 'diversion of /usr/bin/pkg-config to /usr/bin/pkg-config.real by pkgconf' Removing 'diversion of /usr/share/aclocal/pkg.m4 to /usr/share/aclocal/pkg.real.m4 by pkgconf' Removing 'diversion of /usr/share/man/man1/pkg-config.1.gz to /usr/share/man/man1/pkg-config.real.1.gz by pkgconf' Removing 'diversion of /usr/share/pkg-config-crosswrapper to /usr/share/pkg-config-crosswrapper.real by pkgconf' Selecting previously unselected package pkg-config. (Reading database ... 126257 files and directories currently installed.) Preparing to unpack .../pkg-config_0.29.2-1ubuntu3_amd64.deb ... 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Processing triggers for libc-bin (2.35-0ubuntu3.8) ... /sbin/ldconfig.real: /usr/local/lib/libtcm_debug.so.1 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libtbbbind_2_0.so.3 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libur_adapter_opencl.so.0 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libtbbmalloc.so.2 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libtbb.so.12 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libtbbbind.so.3 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libur_loader.so.0 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libtbbbind_2_5.so.3 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libhwloc.so.15 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libur_adapter_level_zero.so.0 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libumf.so.0 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libtbbmalloc_proxy.so.2 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libur_adapter_level_zero_v2.so.0 is not a symbolic link /sbin/ldconfig.real: /usr/local/lib/libtcm.so.1 is not a symbolic link The following packages were automatically installed and are no longer required: libbz2-dev libpkgconf3 libreadline-dev Use 'apt autoremove' to remove them. The following NEW packages will be installed: unionfs-fuse 0 upgraded, 1 newly installed, 0 to remove and 41 not upgraded. Need to get 48.7 kB of archives. After this operation, 146 kB of additional disk space will be used. Selecting previously unselected package unionfs-fuse. (Reading database ... 126346 files and directories currently installed.) Preparing to unpack .../unionfs-fuse_1.0-1ubuntu2_amd64.deb ... Unpacking unionfs-fuse (1.0-1ubuntu2) ... Setting up unionfs-fuse (1.0-1ubuntu2) ... Processing triggers for man-db (2.10.2-1) ... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 2.3/2.3 GB 444.7 kB/s eta 0:00:00 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 6.1/6.1 MB 89.3 MB/s eta 0:00:00 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 4.4/4.4 MB 76.9 MB/s eta 0:00:00 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 2.0/2.0 MB 16.6 MB/s eta 0:00:00 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 4.6/4.6 MB 78.7 MB/s eta 0:00:00 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 63.3/63.3 MB 11.3 MB/s eta 0:00:00 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 96.4/96.4 kB 3.0 MB/s eta 0:00:00 ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts. torchtune 0.6.1 requires torchdata==0.11.0, but you have torchdata 0.6.0 which is incompatible. ERROR: Could not find a version that satisfies the requirement xformers==0.0.19 (from versions: 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.0.6, 0.0.7, 0.0.8, 0.0.9, 0.0.10, 0.0.11, 0.0.12, 0.0.13, 0.0.16rc424, 0.0.16rc425, 0.0.16, 0.0.20, 0.0.21, 0.0.22, 0.0.22.post7, 0.0.23, 0.0.23.post1, 0.0.24, 0.0.25, 0.0.25.post1, 0.0.26.post1, 0.0.27, 0.0.27.post1, 0.0.27.post2, 0.0.28, 0.0.28.post1, 0.0.28.post2, 0.0.28.post3, 0.0.29, 0.0.29.post1, 0.0.29.post2, 0.0.29.post3, 0.0.30, 0.0.31, 0.0.31.post1, 0.0.32.dev1062, 0.0.32.dev1064) ERROR: No matching distribution found for xformers==0.0.19 Failed to open /content/drive/MyDrive/stable-diffusion-webui-colab/stable-diffusion-webui/extensions/sd-webui-additional-networks/models/lora/: No such file or directory. Aborting! /content/drive/MyDrive/stable-diffusion-webui-colab/stable-diffusion-webui Updating files: 100% (203/203), done. HEAD is now at 22bcc7be attempted fix for infinite loading for settings that some people experience Updating files: 100% (135/135), done. HEAD is now at cf1d67a Update modelcard.md HEAD is now at c202932 GRADIO_TUNNEL online Already up to date. Download Results: gid |stat|avg speed |path/URI ======+====+===========+======================================================= 20d2be|OK | 0B/s|/content/drive/MyDrive/stable-diffusion-webui-colab/stable-diffusion-webui/models/CLIP/ViT-L-14.pt Status Legend: (OK):download completed. Python 3.11.13 (main, Jun 4 2025, 08:57:29) [GCC 11.4.0] Commit hash: 22bcc7be428c94e9408f589966c2040187245d81 Installing gfpgan Installing clip Installing open_clip Installing xformers Traceback (most recent call last): File "/content/drive/MyDrive/stable-diffusion-webui-colab/stable-diffusion-webui/launch.py", line 355, in <module> prepare_environment() File "/content/drive/MyDrive/stable-diffusion-webui-colab/stable-diffusion-webui/launch.py", line 281, in prepare_environment run_pip(f"install {xformers_package}", "xformers") File "/content/drive/MyDrive/stable-diffusion-webui-colab/stable-diffusion-webui/launch.py", line 129, in run_pip return run(f'"{python}" -m pip {args} --prefer-binary{index_url_line}', desc=f"Installing {desc}", errdesc=f"Couldn't install {desc}") ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/content/drive/MyDrive/stable-diffusion-webui-colab/stable-diffusion-webui/launch.py", line 97, in run raise RuntimeError(message) RuntimeError: Couldn't install xformers. Command: "/usr/bin/python3" -m pip install xformers==0.0.16rc425 --prefer-binary Error code: 1 stdout: Collecting xformers==0.0.16rc425 Downloading xformers-0.0.16rc425.tar.gz (7.3 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 7.3/7.3 MB 81.4 MB/s eta 0:00:00 Preparing metadata (setup.py): started Preparing metadata (setup.py): finished with status 'done' Requirement already satisfied: torch>=1.12 in /usr/local/lib/python3.11/dist-packages (from xformers==0.0.16rc425) (2.0.0+cu118) Requirement already satisfied: numpy in /usr/local/lib/python3.11/dist-packages (from xformers==0.0.16rc425) (2.0.2) Collecting pyre-extensions==0.0.23 (from xformers==0.0.16rc425) Downloading pyre_extensions-0.0.23-py3-none-any.whl.metadata (4.0 kB) Collecting typing-inspect (from pyre-extensions==0.0.23->xformers==0.0.16rc425) Downloading typing_inspect-0.9.0-py3-none-any.whl.metadata (1.5 kB) Requirement already satisfied: typing-extensions in /usr/local/lib/python3.11/dist-packages (from pyre-extensions==0.0.23->xformers==0.0.16rc425) (4.14.1) Requirement already satisfied: filelock in /usr/local/lib/python3.11/dist-packages (from torch>=1.12->xformers==0.0.16rc425) (3.18.0) Requirement already satisfied: sympy in /usr/local/lib/python3.11/dist-packages (from torch>=1.12->xformers==0.0.16rc425) (1.13.1) Requirement already satisfied: networkx in /usr/local/lib/python3.11/dist-packages (from torch>=1.12->xformers==0.0.16rc425) (3.5) Requirement already satisfied: jinja2 in /usr/local/lib/python3.11/dist-packages (from torch>=1.12->xformers==0.0.16rc425) (3.1.6) Requirement already satisfied: triton==2.0.0 in /usr/local/lib/python3.11/dist-packages (from torch>=1.12->xformers==0.0.16rc425) (2.0.0) Requirement already satisfied: cmake in /usr/local/lib/python3.11/dist-packages (from triton==2.0.0->torch>=1.12->xformers==0.0.16rc425) (3.31.6) Requirement already satisfied: lit in /usr/local/lib/python3.11/dist-packages (from triton==2.0.0->torch>=1.12->xformers==0.0.16rc425) (18.1.8) Requirement already satisfied: MarkupSafe>=2.0 in /usr/local/lib/python3.11/dist-packages (from jinja2->torch>=1.12->xformers==0.0.16rc425) (3.0.2) Requirement already satisfied: mpmath<1.4,>=1.1.0 in /usr/local/lib/python3.11/dist-packages (from sympy->torch>=1.12->xformers==0.0.16rc425) (1.3.0) Collecting mypy-extensions>=0.3.0 (from typing-inspect->pyre-extensions==0.0.23->xformers==0.0.16rc425) Downloading mypy_extensions-1.1.0-py3-none-any.whl.metadata (1.1 kB) Downloading pyre_extensions-0.0.23-py3-none-any.whl (11 kB) Downloading typing_inspect-0.9.0-py3-none-any.whl (8.8 kB) Downloading mypy_extensions-1.1.0-py3-none-any.whl (5.0 kB) Building wheels for collected packages: xformers Building wheel for xformers (setup.py): started Building wheel for xformers (setup.py): finished with status 'error' Running setup.py clean for xformers Failed to build xformers stderr: error: subprocess-exited-with-error × python setup.py bdist_wheel did not run successfully. │ exit code: 1 ╰─> See above for output. note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for xformers ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (xformers)

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