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<h1 class="relative group"><a id="modelli-encoder" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#modelli-encoder"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a>
	<span>Modelli encoder
	</span></h1>



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<p>I modelli encoder utilizzano solo l’encoder di un modello Transformer. In ogni fase, gli attention layer hanno accesso a tutte le parole della frase di partenza. Questi modelli sono spesso caratterizzati come aventi attenzione “bi-direzionale” e chiamati <em>auto-encoding models</em>.</p>
<p>Solitamente, il pre-addestramento di questi modelli consiste nel corrompere una determinata frase (ad esempio, nascondendone casualmente alcune parole) e incaricare il modello di ritrovare o ricostruire la frase di partenza.</p>
<p>I modelli encoder sono particolarmente appropriati per compiti che richiedono la comprensione di frasi intere, quali la classificazione di frasi, riconoscimento delle entità nominate (e in senso più ampio, la classificazione di parole), e l’estrazione di risposte da un contesto.</p>
<p>Alcuni esempi di modelli di questo tipo includono:</p>
<ul><li><a href="https://huggingface.co/transformers/model_doc/albert.html" rel="nofollow">ALBERT</a></li>
<li><a href="https://huggingface.co/transformers/model_doc/bert.html" rel="nofollow">BERT</a></li>
<li><a href="https://huggingface.co/transformers/model_doc/distilbert.html" rel="nofollow">DistilBERT</a></li>
<li><a href="https://huggingface.co/transformers/model_doc/electra.html" rel="nofollow">ELECTRA</a></li>
<li><a href="https://huggingface.co/transformers/model_doc/roberta.html" rel="nofollow">RoBERTa</a></li></ul>


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