name: NGramCache

synopsis:


g++ [flags ...] file ... -l /isip/tools/lib/$ISIP_BINARY/lib_search.a

#include <NGramCache.h>

long length() const;
float getScore(NGramModel& model, Context& context);

quick start:


Context context;
NGramModel ngram_model;
NGramCache nsymbol_cache;

nsymbol_cache.getScore(ngram_model, context);

description:

This class computes the N-Gram score for a sequence on N symbols represented by the input context:

Pr(context) = Pr(context(K - 1) | context(K - 2), .., context(K - N))

where K is the current context index and N is the length of the context.

dependencies:

public constants:

define public constants:

static const String CLASS_NAME;

static const String DEF_PARAM;

static const long DEF_CAPACITY = 12000;

error codes:

error codes indicating general errors:

protected data:

define the main cache data structure:

HashTable<Context, Float> cache_d;

declare the debugging parameters:
```
static Integral::DEBUG debug_level_d;
```
declare the memory manager:
```
static MemoryManager mgr_d;
```

required public methods:

static methods:
```
static const String& name();
```

debug methods:

static boolean diagnose(Integral::DEBUG debug_level);

boolean debug(const unichar* message) const;

static boolean setDebug(Integral::DEBUG debug_level);

destructor/constructor(s):

~NGramCache();

NGramCache();

NGramCache(const NGramCache& arg);

assign methods:
```
boolean assign(const NGramCache& arg);
```
operator= method:
```
not present.
```

i/o methods:

long sofSize() const;

boolean read(Sof& sof, long tag, const String& cname = CLASS_NAME);

boolean write(Sof& sof, long tag, const String& cname = CLASS_NAME) const;

boolean readData(Sof& sof, const String& pname = DEF_PARAM, long size = SofParser::FULL_OBJECT, boolean param = true, boolean nested = false);

boolean writeData(Sof& sof, const String& pname = DEF_PARAM) const;

equality methods:

boolean eq(const NGramCache& arg) const;

memory management methods:

static void* operator new(size_t size);

static void* operator new[](size_t size);

static void operator delete(void* ptr);

static void operator delete[](void* ptr);

static boolean setGrowSize(long grow_size);

boolean clear(Integral::CMODE ctype = Integral::DEF_CMODE);

class-specific public methods:

declare class specific methods:

long length() const;

float getScore(NGramModel& model, Context& context);

private methods:

none.

examples:

none.

notes:

none.