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<html><head><title>dlib C++ Library - random_hashing_abstract.h</title></head><body bgcolor='white'><pre> |
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<font color='#009900'>// Copyright (C) 2012 Davis E. King ([email protected]) |
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</font><font color='#009900'>// License: Boost Software License See LICENSE.txt for the full license. |
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</font><font color='#0000FF'>#undef</font> DLIB_RANDOM_HAsHING_ABSTRACT_Hh_ |
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<font color='#0000FF'>#ifdef</font> DLIB_RANDOM_HAsHING_ABSTRACT_Hh_ |
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='random_hashing_abstract.h.html'>random_hashing_abstract.h</a>" |
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='murmur_hash3.h.html'>murmur_hash3.h</a>" |
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<font color='#0000FF'>namespace</font> dlib |
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<b>{</b> |
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<font color='#009900'>// ---------------------------------------------------------------------------------------- |
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</font> |
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<font color='#0000FF'><u>double</u></font> <b><a name='uniform_random_hash'></a>uniform_random_hash</b> <font face='Lucida Console'>(</font> |
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<font color='#0000FF'>const</font> uint64<font color='#5555FF'>&</font> k1, |
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<font color='#0000FF'>const</font> uint64<font color='#5555FF'>&</font> k2, |
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<font color='#0000FF'>const</font> uint64<font color='#5555FF'>&</font> k3 |
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<font face='Lucida Console'>)</font>; |
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<font color='#009900'>/*! |
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ensures |
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- This function uses hashing to generate uniform random values in the range [0,1). |
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- To define this function precisely, assume we have an arbitrary sequence of |
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input triplets. Then calling uniform_random_hash() on each of them should |
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result in a sequence of double values that look like numbers sampled |
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independently and uniformly at random from the interval [0,1). This is true |
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even if there is some simple pattern in the inputs. For example, (0,0,0), |
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(1,0,0), (2,0,0), (3,0,0), etc. |
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- This function is deterministic. That is, the same output is always returned |
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when given the same input. |
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!*/</font> |
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<font color='#009900'>// ---------------------------------------------------------------------------------------- |
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</font> |
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<font color='#0000FF'><u>double</u></font> <b><a name='gaussian_random_hash'></a>gaussian_random_hash</b> <font face='Lucida Console'>(</font> |
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<font color='#0000FF'>const</font> uint64<font color='#5555FF'>&</font> k1, |
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<font color='#0000FF'>const</font> uint64<font color='#5555FF'>&</font> k2, |
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<font color='#0000FF'>const</font> uint64<font color='#5555FF'>&</font> k3 |
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<font face='Lucida Console'>)</font>; |
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<font color='#009900'>/*! |
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ensures |
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- This function uses hashing to generate Gaussian distributed random values |
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with mean 0 and variance 1. |
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- To define this function precisely, assume we have an arbitrary sequence of |
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input triplets. Then calling gaussian_random_hash() on each of them should |
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result in a sequence of double values that look like numbers sampled |
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independently from a standard normal distribution. This is true even if |
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there is some simple pattern in the inputs. For example, (0,0,0), (1,0,0), |
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(2,0,0), (3,0,0), etc. |
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- This function is deterministic. That is, the same output is always returned |
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when given the same input. |
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!*/</font> |
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<font color='#009900'>// ---------------------------------------------------------------------------------------- |
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</font> |
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<b>}</b> |
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<font color='#0000FF'>#endif</font> <font color='#009900'>// DLIB_RANDOM_HAsHING_ABSTRACT_Hh_ |
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</font> |
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</pre></body></html> |
