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layout: stdlib-reference
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# IBackwardDifferentiable\<FType\>\.apply\_bwd

## Description





## Signature 

<pre>
<a href="index.html" class="code_type">IBackwardDifferentiable</a>&lt;<a href="index.html#typeparam-FType" class="code_type">FType</a>&gt;.<a href="apply_bwd.html">apply_bwd</a> : <a href="../../types/applyforbwdfunctype-058bf/index.html" class="code_type">ApplyForBwdFuncType</a>&lt;<a href="index.html#typeparam-FType" class="code_type">FType</a>, <a href="index.html" class="code_type">IBackwardDifferentiable</a>&lt;<a href="index.html#typeparam-FType" class="code_type">FType</a>&gt;.<span class="code_keyword">This</span>.MinimalContext&gt;
</pre>