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| <div class="subTitle">org.apache.arrow.memory.util</div> |
| <h2 title="Class Float16" class="title">Class Float16</h2> |
| </div> |
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| <ul class="inheritance"> |
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| <pre>public class <span class="typeNameLabel">Float16</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Lifted from Apache Parquet MR project: |
| https://github.com/apache/parquet-mr/blob/e87b80308869b77f914fcfd04364686e11158950/parquet-column/src/main/java/org/apache/parquet/schema/Float16.java |
| <ul> |
| Changes made: |
| <li>Modify the data type input from Parquet-MR Binary (toFloat(Binary b)) to Arrow Java short (toFloat(short b))</li> |
| <li>Expose NAN and POSITIVE_INFINITY variables</li> |
| </ul> |
| |
| |
| The class is a utility class to manipulate half-precision 16-bit |
| <a href="https://en.wikipedia.org/wiki/Half-precision_floating-point_format">IEEE 754</a> |
| floating point data types (also called fp16 or binary16). A half-precision float can be |
| created from or converted to single-precision floats, and is stored in a short data type. |
| The IEEE 754 standard specifies an float16 as having the following format: |
| <ul> |
| <li>Sign bit: 1 bit</li> |
| <li>Exponent width: 5 bits</li> |
| <li>Significand: 10 bits</li> |
| </ul> |
| |
| <p>The format is laid out as follows:</p> |
| <pre> |
| 1 11111 1111111111 |
| ^ --^-- -----^---- |
| sign | |_______ significand |
| | |
| -- exponent |
| </pre> |
| Half-precision floating points can be useful to save memory and/or |
| bandwidth at the expense of range and precision when compared to single-precision |
| floating points (float32). |
| Ref: https://android.googlesource.com/platform/libcore/+/master/luni/src/main/java/libcore/util/FP16.java</div> |
| </li> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static short</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/memory/util/Float16.html#NaN">NaN</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static short</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/memory/util/Float16.html#POSITIVE_INFINITY">POSITIVE_INFINITY</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/memory/util/Float16.html#Float16--">Float16</a></span>()</code> </td> |
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| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/memory/util/Float16.html#compare-short-short-">compare</a></span>(short x, |
| short y)</code> |
| <div class="block">Compares the two specified half-precision float values.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/memory/util/Float16.html#isNaN-short-">isNaN</a></span>(short h)</code> |
| <div class="block">Returns true if the specified half-precision float value represents |
| a Not-a-Number, false otherwise.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/memory/util/Float16.html#toFloat-short-">toFloat</a></span>(short b)</code> |
| <div class="block">Converts the specified half-precision float value into a |
| single-precision float value.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static short</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/memory/util/Float16.html#toFloat16-float-">toFloat16</a></span>(float f)</code> |
| <div class="block">Converts the specified single-precision float value into a |
| half-precision float value.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/memory/util/Float16.html#toFloatString-short-">toFloatString</a></span>(short h)</code> |
| <div class="block">Returns a string representation of the specified half-precision |
| float value.</div> |
| </td> |
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| <!-- --> |
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| <h4>POSITIVE_INFINITY</h4> |
| <pre>public static final short POSITIVE_INFINITY</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../constant-values.html#org.apache.arrow.memory.util.Float16.POSITIVE_INFINITY">Constant Field Values</a></dd> |
| </dl> |
| </li> |
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| <h4>NaN</h4> |
| <pre>public static final short NaN</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../constant-values.html#org.apache.arrow.memory.util.Float16.NaN">Constant Field Values</a></dd> |
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| <pre>public Float16()</pre> |
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| <pre>public static boolean isNaN(short h)</pre> |
| <div class="block">Returns true if the specified half-precision float value represents |
| a Not-a-Number, false otherwise.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>h</code> - A half-precision float value</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>True if the value is a NaN, false otherwise</dd> |
| </dl> |
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| <h4>compare</h4> |
| <pre>public static int compare(short x, |
| short y)</pre> |
| <div class="block"><p>Compares the two specified half-precision float values. The following |
| conditions apply during the comparison:</p> |
| |
| <ul> |
| <li>NaN is considered by this method to be equal to itself and greater |
| than all other half-precision float values (including <code>#POSITIVE_INFINITY</code>)</li> |
| <li>POSITIVE_ZERO is considered by this method to be greater than NEGATIVE_ZERO.</li> |
| </ul></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>x</code> - The first half-precision float value to compare.</dd> |
| <dd><code>y</code> - The second half-precision float value to compare</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The value <code>0</code> if <code>x</code> is numerically equal to <code>y</code>, a |
| value less than <code>0</code> if <code>x</code> is numerically less than <code>y</code>, |
| and a value greater than <code>0</code> if <code>x</code> is numerically greater |
| than <code>y</code></dd> |
| </dl> |
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| </a> |
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| <h4>toFloat</h4> |
| <pre>public static float toFloat(short b)</pre> |
| <div class="block">Converts the specified half-precision float value into a |
| single-precision float value. The following special cases are handled: |
| If the input is NaN, the returned value is Float NaN. |
| If the input is POSITIVE_INFINITY or NEGATIVE_INFINITY, the returned value is respectively |
| Float POSITIVE_INFINITY or Float NEGATIVE_INFINITY. |
| If the input is 0 (positive or negative), the returned value is +/-0.0f. |
| Otherwise, the returned value is a normalized single-precision float value.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>b</code> - The half-precision float value to convert to single-precision</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A normalized single-precision float value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="toFloat16-float-"> |
| <!-- --> |
| </a> |
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| <h4>toFloat16</h4> |
| <pre>public static short toFloat16(float f)</pre> |
| <div class="block">Converts the specified single-precision float value into a |
| half-precision float value. The following special cases are handled: |
| |
| If the input is NaN, the returned value is NaN. |
| If the input is Float POSITIVE_INFINITY or Float NEGATIVE_INFINITY, |
| the returned value is respectively POSITIVE_INFINITY or NEGATIVE_INFINITY. |
| If the input is 0 (positive or negative), the returned value is |
| POSITIVE_ZERO or NEGATIVE_ZERO. |
| If the input is a less than MIN_VALUE, the returned value |
| is flushed to POSITIVE_ZERO or NEGATIVE_ZERO. |
| If the input is a less than MIN_NORMAL, the returned value |
| is a denorm half-precision float. |
| Otherwise, the returned value is rounded to the nearest |
| representable half-precision float value.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>f</code> - The single-precision float value to convert to half-precision</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A half-precision float value</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
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| <h4>toFloatString</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toFloatString(short h)</pre> |
| <div class="block">Returns a string representation of the specified half-precision |
| float value. Calling this method is equivalent to calling |
| <code>Float.toString(toFloat(h))</code>. See <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Float.html?is-external=true#toString-float-" title="class or interface in java.lang"><code>Float.toString(float)</code></a> |
| for more information on the format of the string representation.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>h</code> - A half-precision float value in binary little-endian format</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A string representation of the specified value</dd> |
| </dl> |
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