@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(1, getBoundingPoly());
    }
    if (java.lang.Float.floatToRawIntBits(confidence_) != 0) {
      output.writeFloat(2, confidence_);
    }
    if (java.lang.Float.floatToRawIntBits(importanceFraction_) != 0) {
      output.writeFloat(3, importanceFraction_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Fraction of importance of this salient region with respect to the original
image.
</pre>

<code>float importance_fraction = 3;</code>

@return The importanceFraction.
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/CropHint.java