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diff --git a/ml/dlib/dlib/entropy_decoder_model/entropy_decoder_model_kernel_6.h b/ml/dlib/dlib/entropy_decoder_model/entropy_decoder_model_kernel_6.h
deleted file mode 100644
index dc23f10eb..000000000
--- a/ml/dlib/dlib/entropy_decoder_model/entropy_decoder_model_kernel_6.h
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@@ -1,131 +0,0 @@
-// Copyright (C) 2005 Davis E. King (davis@dlib.net)
-// License: Boost Software License See LICENSE.txt for the full license.
-#ifndef DLIB_ENTROPY_DECODER_MODEL_KERNEl_6_
-#define DLIB_ENTROPY_DECODER_MODEL_KERNEl_6_
-
-#include "../algs.h"
-#include "entropy_decoder_model_kernel_abstract.h"
-#include "../assert.h"
-
-namespace dlib
-{
-
- template <
- unsigned long alphabet_size,
- typename entropy_decoder
- >
- class entropy_decoder_model_kernel_6
- {
- /*!
- INITIAL VALUE
- This object has no state
-
- CONVENTION
- &get_entropy_decoder() == coder
-
- This is an order-(-1) model. So it doesn't really do anything.
- Every symbol has the same probability.
- !*/
-
- public:
-
- typedef entropy_decoder entropy_decoder_type;
-
- entropy_decoder_model_kernel_6 (
- entropy_decoder& coder
- );
-
- virtual ~entropy_decoder_model_kernel_6 (
- );
-
- inline void clear(
- );
-
- inline void decode (
- unsigned long& symbol
- );
-
- entropy_decoder& get_entropy_decoder (
- ) { return coder; }
-
- static unsigned long get_alphabet_size (
- ) { return alphabet_size; }
-
- private:
-
- entropy_decoder& coder;
-
- // restricted functions
- entropy_decoder_model_kernel_6(entropy_decoder_model_kernel_6<alphabet_size,entropy_decoder>&); // copy constructor
- entropy_decoder_model_kernel_6<alphabet_size,entropy_decoder>& operator=(entropy_decoder_model_kernel_6<alphabet_size,entropy_decoder>&); // assignment operator
-
- };
-
-// ----------------------------------------------------------------------------------------
-// ----------------------------------------------------------------------------------------
- // member function definitions
-// ----------------------------------------------------------------------------------------
-// ----------------------------------------------------------------------------------------
-
- template <
- unsigned long alphabet_size,
- typename entropy_decoder
- >
- entropy_decoder_model_kernel_6<alphabet_size,entropy_decoder>::
- entropy_decoder_model_kernel_6 (
- entropy_decoder& coder_
- ) :
- coder(coder_)
- {
- COMPILE_TIME_ASSERT( 1 < alphabet_size && alphabet_size < 65535 );
- }
-
-// ----------------------------------------------------------------------------------------
-
- template <
- unsigned long alphabet_size,
- typename entropy_decoder
- >
- entropy_decoder_model_kernel_6<alphabet_size,entropy_decoder>::
- ~entropy_decoder_model_kernel_6 (
- )
- {
- }
-
-// ----------------------------------------------------------------------------------------
-
- template <
- unsigned long alphabet_size,
- typename entropy_decoder
- >
- void entropy_decoder_model_kernel_6<alphabet_size,entropy_decoder>::
- clear(
- )
- {
- }
-
-// ----------------------------------------------------------------------------------------
-
- template <
- unsigned long alphabet_size,
- typename entropy_decoder
- >
- void entropy_decoder_model_kernel_6<alphabet_size,entropy_decoder>::
- decode (
- unsigned long& symbol
- )
- {
- unsigned long target;
-
- target = coder.get_target(alphabet_size);
- coder.decode(target,target+1);
-
- symbol = target;
- }
-
-// ----------------------------------------------------------------------------------------
-
-}
-
-#endif // DLIB_ENTROPY_DECODER_MODEL_KERNEl_6_
-