mnist-utils.c File Reference

Utitlies for handling the MNIST data set files. More...

#include <stdlib.h>
#include <string.h>
#include "mnist-utils.h"

Functions
uint32_t	flipBytes (uint32_t n)
void	readImageFileHeader (FILE *imageFile, MNIST_ImageFileHeader *ifh)
void	readLabelFileHeader (FILE *imageFile, MNIST_LabelFileHeader *lfh)
FILE *	openMNISTImageFile (char *fileName)
	Returns a file pointer to the MNIST image file. More...
FILE *	openMNISTLabelFile (char *fileName)
	Returns a file pointer to the MNIST label file. More...
MNIST_Image	getImage (FILE *imageFile)
	Returns the next image in given MNIST image file. More...
MNIST_Image	getImageByPosition (FILE *imageFile, int position)
MNIST_Label	getLabel (FILE *labelFile)
	Returns the next label in given MNIST label file. More...
MNIST_Label	getLabelByPosition (FILE *labelFile, int position)
Vector *	getVectorFromImage (MNIST_Image *img)
	Returns a Vector holding the image pixels of a given MNIST image. More...

Detailed Description

Utitlies for handling the MNIST data set files.

See also

http://yann.lecun.com/exdb/mnist/

Author

Matt Lind

Date

July 2015

Function Documentation

uint32_t flipBytes

(

uint32_t

n

)

Reverse byte order in 32bit numbers MNIST files contain all numbers in reversed byte order, and hence must be reversed before using

MNIST_Image getImage

(

FILE *

imageFile

)

Returns the next image in given MNIST image file.

Returns the next image in the given MNIST image file

MNIST_Image getImageByPosition	(	FILE *	imageFile,
		int	position
	)

Returns the image located at the specified position in the given MNIST image file

MNIST_Label getLabel

(

FILE *

labelFile

)

Returns the next label in given MNIST label file.

Returns the next label in the given MNIST label file

MNIST_Label getLabelByPosition	(	FILE *	labelFile,
		int	position
	)

Returns the label located at the specified position in the given MNIST label file

Vector* getVectorFromImage

(

MNIST_Image *

img

)

Returns a Vector holding the image pixels of a given MNIST image.

Parameters

img	A pointer to a MNIST image

FILE* openMNISTImageFile

(

char *

fileName

)

Returns a file pointer to the MNIST image file.

Opens the file and moves the read pointer to the position of the 1st image

See also

http://yann.lecun.com/exdb/mnist/ for more details on the file definition

FILE* openMNISTLabelFile

(

char *

fileName

)

Returns a file pointer to the MNIST label file.

Opens the file and moves the read pointer to the position of the 1st label

See also

http://yann.lecun.com/exdb/mnist/ for more details on the file definition

void readImageFileHeader	(	FILE *	imageFile,
		MNIST_ImageFileHeader *	ifh
	)

Read MNIST image file header

See also

http://yann.lecun.com/exdb/mnist/ for definition details

void readLabelFileHeader	(	FILE *	imageFile,
		MNIST_LabelFileHeader *	lfh
	)

Read MNIST label file header

See also

http://yann.lecun.com/exdb/mnist/ for definition details