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  <p>IfOp should have only one branch. An IfOp operator takes a <code class="docutils literal"><span class="pre">cond</span></code> variable whose value must be a vector of N boolean elements. Its return value has N instances. If cond[i] == True, input instance input[i] will go through true_block() and generate output[i]; otherwise it will produce output from false_bloack().</p>
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<div class="highlight-python"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">paddle</span> <span class="kn">as</span> <span class="nn">pd</span>

<span class="n">x</span> <span class="o">=</span> <span class="n">var</span><span class="p">()</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">var</span><span class="p">()</span>
<span class="n">cond</span> <span class="o">=</span> <span class="n">var</span><span class="p">()</span>
<span class="n">default_value</span> <span class="o">=</span> <span class="n">var</span><span class="p">()</span>
<span class="n">b</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">create_ifelseop</span><span class="p">(</span><span class="n">inputs</span><span class="o">=</span><span class="p">[</span><span class="n">x</span><span class="p">],</span> <span class="n">output_num</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="k">with</span> <span class="n">b</span><span class="o">.</span><span class="n">true_block</span><span class="p">():</span>
    <span class="n">x</span> <span class="o">=</span> <span class="n">b</span><span class="o">.</span><span class="n">inputs</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
    <span class="n">z</span> <span class="o">=</span> <span class="n">operator</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
    <span class="n">b</span><span class="o">.</span><span class="n">set_output</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">operator</span><span class="o">.</span><span class="n">softmax</span><span class="p">(</span><span class="n">z</span><span class="p">))</span>

<span class="k">with</span> <span class="n">b</span><span class="o">.</span><span class="n">false_block</span><span class="p">():</span>
    <span class="n">x</span> <span class="o">=</span> <span class="n">b</span><span class="o">.</span><span class="n">inputs</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
    <span class="n">z</span> <span class="o">=</span> <span class="n">layer</span><span class="o">.</span><span class="n">fc</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
    <span class="n">b</span><span class="o">.</span><span class="n">set_output</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">operator</span><span class="o">.</span><span class="n">softmax</span><span class="p">(</span><span class="n">z</span><span class="p">))</span>

<span class="n">out</span> <span class="o">=</span> <span class="n">b</span><span class="p">(</span><span class="n">cond</span><span class="p">)</span>
</pre></div>
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<p>If only true_block is set in an IfElseOp, a special case is that we can have a default value for false as:</p>
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216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">paddle</span> <span class="kn">as</span> <span class="nn">pd</span>

<span class="n">x</span> <span class="o">=</span> <span class="n">var</span><span class="p">()</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">var</span><span class="p">()</span>
<span class="n">cond</span> <span class="o">=</span> <span class="n">var</span><span class="p">()</span>
<span class="n">default_value</span> <span class="o">=</span> <span class="n">var</span><span class="p">()</span>
<span class="n">b</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">create_ifelseop</span><span class="p">(</span><span class="n">inputs</span><span class="o">=</span><span class="p">[</span><span class="n">x</span><span class="p">],</span> <span class="n">output_num</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">default_value</span><span class="p">)</span>

<span class="k">with</span> <span class="n">b</span><span class="o">.</span><span class="n">true_block</span><span class="p">():</span>
    <span class="n">x</span> <span class="o">=</span> <span class="n">b</span><span class="o">.</span><span class="n">inputs</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
    <span class="n">z</span> <span class="o">=</span> <span class="n">operator</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
    <span class="n">b</span><span class="o">.</span><span class="n">set_output</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">operator</span><span class="o">.</span><span class="n">softmax</span><span class="p">(</span><span class="n">z</span><span class="p">))</span>

<span class="n">out</span> <span class="o">=</span> <span class="n">b</span><span class="p">(</span><span class="n">cond</span><span class="p">)</span>
</pre></div>
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<p>where default_value is a list of vars for <code class="docutils literal"><span class="pre">cond</span></code> == False.</p>


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