import{s as kl,o as wl}from"../chunks/scheduler.37c15a92.js";import{S as gl,i as Cl,g as _,s as p,r as y,A as hl,h as b,f as r,c as f,j as $l,u as M,x as $,k as yl,y as Jl,a as o,v as d,t as m,b as je,d as c,w as k,p as ve}from"../chunks/index.2bf4358c.js";import{Y as Ml}from"../chunks/Youtube.1e50a667.js";import{C}from"../chunks/CodeBlock.4f5fc1ad.js";import{C as dl}from"../chunks/CourseFloatingBanner.06521e8b.js";import{F as Tl}from"../chunks/FrameworkSwitchCourse.8d4d4ab6.js";import{H as Ge,E as jl}from"../chunks/EditOnGithub.8916dc7c.js";function vl(u){let l,s;return l=new dl({props:{chapter:2,classNames:"absolute z-10 right-0 top-0",notebooks:[{label:"Google Colab",value:"https://colab.research.google.com/github/huggingface/notebooks/blob/master/course/zh-CN/chapter2/section3_tf.ipynb"},{label:"Aws Studio",value:"https://studiolab.sagemaker.aws/import/github/huggingface/notebooks/blob/master/course/zh-CN/chapter2/section3_tf.ipynb"}]}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function xl(u){let l,s;return l=new dl({props:{chapter:2,classNames:"absolute z-10 right-0 top-0",notebooks:[{label:"Google Colab",value:"https://colab.research.google.com/github/huggingface/notebooks/blob/master/course/zh-CN/chapter2/section3_pt.ipynb"},{label:"Aws Studio",value:"https://studiolab.sagemaker.aws/import/github/huggingface/notebooks/blob/master/course/zh-CN/chapter2/section3_pt.ipynb"}]}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Zl(u){let l,s;return l=new Ml({props:{id:"d3JVgghSOew"}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Bl(u){let l,s;return l=new Ml({props:{id:"AhChOFRegn4"}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Ul(u){let l,s=`在本節中，我們將更詳細地瞭解如何創建和使用模型。我們將使用
AutoModel類，當您希望從檢查點實例化任何模型時，這非常方便。`,t,i,w="這個AutoModel類及其所有相關項實際上是對庫中各種可用模型的簡單包裝。它是一個聰明的包裝器，因為它可以自動猜測檢查點的適當模型體系結構，然後用該體系結構實例化模型。";return{c(){l=_("p"),l.textContent=s,t=p(),i=_("p"),i.textContent=w},l(a){l=b(a,"P",{"data-svelte-h":!0}),$(l)!=="svelte-u0ngs0"&&(l.textContent=s),t=f(a),i=b(a,"P",{"data-svelte-h":!0}),$(i)!=="svelte-muuwa9"&&(i.textContent=w)},m(a,g){o(a,l,g),o(a,t,g),o(a,i,g)},d(a){a&&(r(l),r(t),r(i))}}}function Wl(u){let l,s=`在本節中，我們將更詳細地瞭解如何創建和使用模型。我們將使用
AutoModel類，當您希望從檢查點實例化任何模型時，這非常方便。`,t,i,w="這個AutoModel類及其所有相關項實際上是對庫中各種可用模型的簡單包裝。它是一個聰明的包裝器，因為它可以自動猜測檢查點的適當模型體系結構，然後用該體系結構實例化模型。";return{c(){l=_("p"),l.textContent=s,t=p(),i=_("p"),i.textContent=w},l(a){l=b(a,"P",{"data-svelte-h":!0}),$(l)!=="svelte-u0ngs0"&&(l.textContent=s),t=f(a),i=b(a,"P",{"data-svelte-h":!0}),$(i)!=="svelte-muuwa9"&&(i.textContent=w)},m(a,g){o(a,l,g),o(a,t,g),o(a,i,g)},d(a){a&&(r(l),r(t),r(i))}}}function El(u){let l,s;return l=new C({props:{code:"ZnJvbSUyMHRyYW5zZm9ybWVycyUyMGltcG9ydCUyMEJlcnRDb25maWclMkMlMjBURkJlcnRNb2RlbCUwQSUwQSUyMyUyMEJ1aWxkaW5nJTIwdGhlJTIwY29uZmlnJTBBY29uZmlnJTIwJTNEJTIwQmVydENvbmZpZygpJTBBJTBBJTIzJTIwQnVpbGRpbmclMjB0aGUlMjBtb2RlbCUyMGZyb20lMjB0aGUlMjBjb25maWclMEFtb2RlbCUyMCUzRCUyMFRGQmVydE1vZGVsKGNvbmZpZyk=",highlighted:`<span class="hljs-keyword">from</span> transformers <span class="hljs-keyword">import</span> BertConfig, TFBertModel

<span class="hljs-comment"># Building the config</span>
config = BertConfig()

<span class="hljs-comment"># Building the model from the config</span>
model = TFBertModel(config)`,wrap:!1}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Il(u){let l,s;return l=new C({props:{code:"ZnJvbSUyMHRyYW5zZm9ybWVycyUyMGltcG9ydCUyMEJlcnRDb25maWclMkMlMjBCZXJ0TW9kZWwlMEElMEElMjMlMjBCdWlsZGluZyUyMHRoZSUyMGNvbmZpZyUwQWNvbmZpZyUyMCUzRCUyMEJlcnRDb25maWcoKSUwQSUwQSUyMyUyMEJ1aWxkaW5nJTIwdGhlJTIwbW9kZWwlMjBmcm9tJTIwdGhlJTIwY29uZmlnJTBBbW9kZWwlMjAlM0QlMjBCZXJ0TW9kZWwoY29uZmlnKQ==",highlighted:`<span class="hljs-keyword">from</span> transformers <span class="hljs-keyword">import</span> BertConfig, BertModel

<span class="hljs-comment"># Building the config</span>
config = BertConfig()

<span class="hljs-comment"># Building the model from the config</span>
model = BertModel(config)`,wrap:!1}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Rl(u){let l,s;return l=new C({props:{code:"ZnJvbSUyMHRyYW5zZm9ybWVycyUyMGltcG9ydCUyMEJlcnRDb25maWclMkMlMjBURkJlcnRNb2RlbCUwQSUwQWNvbmZpZyUyMCUzRCUyMEJlcnRDb25maWcoKSUwQW1vZGVsJTIwJTNEJTIwVEZCZXJ0TW9kZWwoY29uZmlnKSUwQSUwQSUyMyUyME1vZGVsJTIwaXMlMjByYW5kb21seSUyMGluaXRpYWxpemVkIQ==",highlighted:`<span class="hljs-keyword">from</span> transformers <span class="hljs-keyword">import</span> BertConfig, TFBertModel

config = BertConfig()
model = TFBertModel(config)

<span class="hljs-comment"># Model is randomly initialized!</span>`,wrap:!1}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Vl(u){let l,s;return l=new C({props:{code:"ZnJvbSUyMHRyYW5zZm9ybWVycyUyMGltcG9ydCUyMEJlcnRDb25maWclMkMlMjBCZXJ0TW9kZWwlMEElMEFjb25maWclMjAlM0QlMjBCZXJ0Q29uZmlnKCklMEFtb2RlbCUyMCUzRCUyMEJlcnRNb2RlbChjb25maWcpJTBBJTBBJTIzJTIwTW9kZWwlMjBpcyUyMHJhbmRvbWx5JTIwaW5pdGlhbGl6ZWQh",highlighted:`<span class="hljs-keyword">from</span> transformers <span class="hljs-keyword">import</span> BertConfig, BertModel

config = BertConfig()
model = BertModel(config)

<span class="hljs-comment"># Model is randomly initialized!</span>`,wrap:!1}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Gl(u){let l,s,t,i="正如您之前看到的，我們可以用等效的AutoModel類替換Bert模型。從現在開始，我們將這樣做，因為這會產生檢查點不可知的代碼；如果您的代碼適用於一個檢查點，那麼它應該與另一個檢查點無縫地工作。即使體系結構不同，這也適用，只要檢查點是針對類似任務（例如，情緒分析任務）訓練的。",w;return l=new C({props:{code:"ZnJvbSUyMHRyYW5zZm9ybWVycyUyMGltcG9ydCUyMFRGQmVydE1vZGVsJTBBJTBBbW9kZWwlMjAlM0QlMjBURkJlcnRNb2RlbC5mcm9tX3ByZXRyYWluZWQoJTIyYmVydC1iYXNlLWNhc2VkJTIyKQ==",highlighted:`<span class="hljs-keyword">from</span> transformers <span class="hljs-keyword">import</span> TFBertModel

model = TFBertModel.from_pretrained(<span class="hljs-string">&quot;bert-base-cased&quot;</span>)`,wrap:!1}}),{c(){y(l.$$.fragment),s=p(),t=_("p"),t.textContent=i},l(a){M(l.$$.fragment,a),s=f(a),t=b(a,"P",{"data-svelte-h":!0}),$(t)!=="svelte-18vxhwi"&&(t.textContent=i)},m(a,g){d(l,a,g),o(a,s,g),o(a,t,g),w=!0},i(a){w||(c(l.$$.fragment,a),w=!0)},o(a){m(l.$$.fragment,a),w=!1},d(a){a&&(r(s),r(t)),k(l,a)}}}function Nl(u){let l,s,t,i="正如您之前看到的，我們可以用等效的AutoModel類替換Bert模型。從現在開始，我們將這樣做，因為這會產生檢查點不可知的代碼；如果您的代碼適用於一個檢查點，那麼它應該與另一個檢查點無縫地工作。即使體系結構不同，這也適用，只要檢查點是針對類似任務（例如，情緒分析任務）訓練的。",w;return l=new C({props:{code:"ZnJvbSUyMHRyYW5zZm9ybWVycyUyMGltcG9ydCUyMEJlcnRNb2RlbCUwQSUwQW1vZGVsJTIwJTNEJTIwQmVydE1vZGVsLmZyb21fcHJldHJhaW5lZCglMjJiZXJ0LWJhc2UtY2FzZWQlMjIp",highlighted:`<span class="hljs-keyword">from</span> transformers <span class="hljs-keyword">import</span> BertModel

model = BertModel.from_pretrained(<span class="hljs-string">&quot;bert-base-cased&quot;</span>)`,wrap:!1}}),{c(){y(l.$$.fragment),s=p(),t=_("p"),t.textContent=i},l(a){M(l.$$.fragment,a),s=f(a),t=b(a,"P",{"data-svelte-h":!0}),$(t)!=="svelte-18vxhwi"&&(t.textContent=i)},m(a,g){d(l,a,g),o(a,s,g),o(a,t,g),w=!0},i(a){w||(c(l.$$.fragment,a),w=!0)},o(a){m(l.$$.fragment,a),w=!1},d(a){a&&(r(s),r(t)),k(l,a)}}}function Ql(u){let l,s;return l=new C({props:{code:"bHMlMjBkaXJlY3Rvcnlfb25fbXlfY29tcHV0ZXIlMEElMEFjb25maWcuanNvbiUyMHRmX21vZGVsLmg1",highlighted:`ls <span class="hljs-keyword">directory_on_my_computer
</span>
<span class="hljs-built_in">config</span>.<span class="hljs-keyword">json </span>tf_model.h5`,wrap:!1}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function zl(u){let l,s;return l=new C({props:{code:"bHMlMjBkaXJlY3Rvcnlfb25fbXlfY29tcHV0ZXIlMEElMEFjb25maWcuanNvbiUyMHB5dG9yY2hfbW9kZWwuYmlu",highlighted:`ls <span class="hljs-keyword">directory_on_my_computer
</span>
<span class="hljs-built_in">config</span>.<span class="hljs-keyword">json </span>pytorch_model.<span class="hljs-keyword">bin</span>`,wrap:!1}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Al(u){let l,s="這個 <em>pytorch_model.bin</em> 文件就是眾所周知的<em>state dictionary</em>; 它包含模型的所有權重。這兩個文件齊頭並進；配置是瞭解模型體系結構所必需的，而模型權重是模型的參數。";return{c(){l=_("p"),l.innerHTML=s},l(t){l=b(t,"P",{"data-svelte-h":!0}),$(l)!=="svelte-ik3ry7"&&(l.innerHTML=s)},m(t,i){o(t,l,i)},d(t){t&&r(l)}}}function Hl(u){let l,s="這個 <em>pytorch_model.bin</em> 文件就是眾所周知的<em>state dictionary</em>; 它包含模型的所有權重。這兩個文件齊頭並進；配置是瞭解模型體系結構所必需的，而模型權重是模型的參數。";return{c(){l=_("p"),l.innerHTML=s},l(t){l=b(t,"P",{"data-svelte-h":!0}),$(l)!=="svelte-ik3ry7"&&(l.innerHTML=s)},m(t,i){o(t,l,i)},d(t){t&&r(l)}}}function Pl(u){let l,s;return l=new C({props:{code:"aW1wb3J0JTIwdGVuc29yZmxvdyUyMGFzJTIwdGYlMEElMEFtb2RlbF9pbnB1dHMlMjAlM0QlMjB0Zi5jb25zdGFudChlbmNvZGVkX3NlcXVlbmNlcyk=",highlighted:`<span class="hljs-keyword">import</span> tensorflow <span class="hljs-keyword">as</span> tf

model_inputs = tf.constant(encoded_sequences)`,wrap:!1}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Xl(u){let l,s;return l=new C({props:{code:"aW1wb3J0JTIwdG9yY2glMEElMEFtb2RlbF9pbnB1dHMlMjAlM0QlMjB0b3JjaC50ZW5zb3IoZW5jb2RlZF9zZXF1ZW5jZXMp",highlighted:`<span class="hljs-keyword">import</span> torch

model_inputs = torch.tensor(encoded_sequences)`,wrap:!1}}),{c(){y(l.$$.fragment)},l(t){M(l.$$.fragment,t)},m(t,i){d(l,t,i),s=!0},i(t){s||(c(l.$$.fragment,t),s=!0)},o(t){m(l.$$.fragment,t),s=!1},d(t){k(l,t)}}}function Yl(u){let l,s,t,i,w,a,g,Qe,h,J,xe,T,j,Ze,Be,Q,Bt="但是，如果您知道要使用的模型類型，則可以使用直接定義其體系結構的類。讓我們看看這是如何與BERT模型一起工作的。",ze,z,Ae,A,Ut="初始化BERT模型需要做的第一件事是加載配置對象：",He,v,x,Ue,H,Wt="配置包含許多用於構建模型的屬性：",Pe,P,Xe,X,Ye,Y,Et="雖然您還沒有看到所有這些屬性都做了什麼，但您應該認識到其中的一些屬性：hidden<em>size屬性定義了hidden</em>狀態向量的大小，num_hidden_layers定義了Transformer模型的層數。",qe,q,Fe,F,It="從默認配置創建模型會使用隨機值對其進行初始化：",Se,Z,B,We,S,Rt=`該模型可以在這種狀態下使用，但會輸出胡言亂語；首先需要對其進行訓練。我們可以根據手頭的任務從頭開始訓練模型，但正如您在
<a href="/course/chapter1">Chapter 1</a>
，這將需要很長的時間和大量的數據，並將產生不可忽視的環境影響。為了避免不必要的重複工作，必須能夠共享和重用已經訓練過的模型。`,De,D,Vt=`加載已經訓練過的Transformers模型很簡單-我們可以使用from_pretrained()
方法：`,Le,U,W,Ee,L,Gt="在上面的代碼示例中，我們沒有使用BertConfig",Ke,K,Nt=`，而是通過Bert base cased標識符加載了一個預訓練模型。這是一個模型檢查點，由BERT的作者自己訓練；您可以在
<a href="https://huggingface.co/bert-base-cased" rel="nofollow">model card</a>中找到更多細節.`,Oe,O,Qt="該模型現在使用檢查點的所有權重進行初始化。它可以直接用於對訓練過的任務進行推理，也可以對新任務進行微調。通過預先訓練重量而不是從頭開始的訓練，我們可以很快取得好的效果。",et,ee,zt=`權重已下載並緩存在緩存文件夾中（因此將來對from_pretrained()方法的調用將不會重新下載它們）默認為
~/.cache/huggingface/transformers
. 您可以通過設置
HF_HOME
環境變量來自定義緩存文件夾。`,tt,te,At=`用於加載模型的標識符可以是模型中心Hub上任何模型的標識符，只要它與BERT體系結構兼容。可以找到可用的BERT檢查點的完整列表
<a href="https://huggingface.co/models?filter=bert" rel="nofollow">here</a>
.`,lt,le,nt,ne,Ht=`保存模型和加載模型一樣簡單—我們使用
save_pretrained()
方法，類似於
from_pretrained()
方法：`,st,se,rt,re,Pt="這會將兩個文件保存到磁盤：",ot,E,I,Ie,oe,Xt=`如果你看一下
config.json
文件，您將識別構建模型體系結構所需的屬性。該文件還包含一些元數據，例如檢查點的來源以及上次保存檢查點時使用的🤗 Transformers版本。`,it,Re,ie,at,ae,Yt="既然您知道了如何加載和保存模型，那麼讓我們嘗試使用它進行一些預測。Transformer模型只能處理數字——分詞器生成的數字。但在我們討論標記化器之前，讓我們先探討模型接受哪些輸入。",pt,pe,qt="標記化器可以將輸入轉換為適當的框架張量，但為了幫助您瞭解發生了什麼，我們將快速瞭解在將輸入發送到模型之前必須做什麼。",ft,fe,Ft="假設我們有幾個序列：",mt,me,ct,ce,St=`分詞器將這些轉換為詞彙表索引，通常稱為
input IDs
. 每個序列現在都是一個數字列表！結果是：`,ut,ue,_t,_e,Dt="這是一個編碼序列列表：一個列表列表。張量只接受矩形（想想矩陣）。此“數組”已為矩形，因此將其轉換為張量很容易：",bt,R,V,Ve,be,$t,$e,Lt="在模型中使用張量非常簡單-我們只需將輸入稱為模型：",yt,ye,Mt,Me,Kt=`雖然模型接受許多不同的參數，但只需要
input IDs。我們稍後將解釋其他參數的作用以及何時需要它們，但首先我們需要更仔細地瞭解
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