New translations svm-scale.c (Chinese Simplified)

lang/zh/gklearn/gedlib/lib/libsvm.3.22/svm-scale.c

@@ -0,0 +1,397 @@
+#include <float.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+
+void exit_with_help()
+{
+	printf(
+	"Usage: svm-scale [options] data_filename\n"
+	"options:\n"
+	"-l lower : x scaling lower limit (default -1)\n"
+	"-u upper : x scaling upper limit (default +1)\n"
+	"-y y_lower y_upper : y scaling limits (default: no y scaling)\n"
+	"-s save_filename : save scaling parameters to save_filename\n"
+	"-r restore_filename : restore scaling parameters from restore_filename\n"
+	);
+	exit(1);
+}
+
+char *line = NULL;
+int max_line_len = 1024;
+double lower=-1.0,upper=1.0,y_lower,y_upper;
+int y_scaling = 0;
+double *feature_max;
+double *feature_min;
+double y_max = -DBL_MAX;
+double y_min = DBL_MAX;
+int max_index;
+int min_index;
+long int num_nonzeros = 0;
+long int new_num_nonzeros = 0;
+
+#define max(x,y) (((x)>(y))?(x):(y))
+#define min(x,y) (((x)<(y))?(x):(y))
+
+void output_target(double value);
+void output(int index, double value);
+char* readline(FILE *input);
+int clean_up(FILE *fp_restore, FILE *fp, const char *msg);
+
+int main(int argc,char **argv)
+{
+	int i,index;
+	FILE *fp, *fp_restore = NULL;
+	char *save_filename = NULL;
+	char *restore_filename = NULL;
+
+	for(i=1;i<argc;i++)
+	{
+		if(argv[i][0] != '-') break;
+		++i;
+		switch(argv[i-1][1])
+		{
+			case 'l': lower = atof(argv[i]); break;
+			case 'u': upper = atof(argv[i]); break;
+			case 'y':
+				y_lower = atof(argv[i]);
+				++i;
+				y_upper = atof(argv[i]);
+				y_scaling = 1;
+				break;
+			case 's': save_filename = argv[i]; break;
+			case 'r': restore_filename = argv[i]; break;
+			default:
+				fprintf(stderr,"unknown option\n");
+				exit_with_help();
+		}
+	}
+
+	if(!(upper > lower) || (y_scaling && !(y_upper > y_lower)))
+	{
+		fprintf(stderr,"inconsistent lower/upper specification\n");
+		exit(1);
+	}
+	
+	if(restore_filename && save_filename)
+	{
+		fprintf(stderr,"cannot use -r and -s simultaneously\n");
+		exit(1);
+	}
+
+	if(argc != i+1) 
+		exit_with_help();
+
+	fp=fopen(argv[i],"r");
+	
+	if(fp==NULL)
+	{
+		fprintf(stderr,"can't open file %s\n", argv[i]);
+		exit(1);
+	}
+
+	line = (char *) malloc(max_line_len*sizeof(char));
+
+#define SKIP_TARGET\
+	while(isspace(*p)) ++p;\
+	while(!isspace(*p)) ++p;
+
+#define SKIP_ELEMENT\
+	while(*p!=':') ++p;\
+	++p;\
+	while(isspace(*p)) ++p;\
+	while(*p && !isspace(*p)) ++p;
+	
+	/* assumption: min index of attributes is 1 */
+	/* pass 1: find out max index of attributes */
+	max_index = 0;
+	min_index = 1;
+
+	if(restore_filename)
+	{
+		int idx, c;
+
+		fp_restore = fopen(restore_filename,"r");
+		if(fp_restore==NULL)
+		{
+			fprintf(stderr,"can't open file %s\n", restore_filename);
+			exit(1);
+		}
+
+		c = fgetc(fp_restore);
+		if(c == 'y')
+		{
+			readline(fp_restore);
+			readline(fp_restore);
+			readline(fp_restore);
+		}
+		readline(fp_restore);
+		readline(fp_restore);
+
+		while(fscanf(fp_restore,"%d %*f %*f\n",&idx) == 1)
+			max_index = max(idx,max_index);
+		rewind(fp_restore);
+	}
+
+	while(readline(fp)!=NULL)
+	{
+		char *p=line;
+
+		SKIP_TARGET
+
+		while(sscanf(p,"%d:%*f",&index)==1)
+		{
+			max_index = max(max_index, index);
+			min_index = min(min_index, index);
+			SKIP_ELEMENT
+			num_nonzeros++;
+		}
+	}
+
+	if(min_index < 1)
+		fprintf(stderr,
+			"WARNING: minimal feature index is %d, but indices should start from 1\n", min_index);
+
+	rewind(fp);
+
+	feature_max = (double *)malloc((max_index+1)* sizeof(double));
+	feature_min = (double *)malloc((max_index+1)* sizeof(double));
+
+	if(feature_max == NULL || feature_min == NULL)
+	{
+		fprintf(stderr,"can't allocate enough memory\n");
+		exit(1);
+	}
+
+	for(i=0;i<=max_index;i++)
+	{
+		feature_max[i]=-DBL_MAX;
+		feature_min[i]=DBL_MAX;
+	}
+
+	/* pass 2: find out min/max value */
+	while(readline(fp)!=NULL)
+	{
+		char *p=line;
+		int next_index=1;
+		double target;
+		double value;
+
+		if (sscanf(p,"%lf",&target) != 1)
+			return clean_up(fp_restore, fp, "ERROR: failed to read labels\n");
+		y_max = max(y_max,target);
+		y_min = min(y_min,target);
+		
+		SKIP_TARGET
+
+		while(sscanf(p,"%d:%lf",&index,&value)==2)
+		{
+			for(i=next_index;i<index;i++)
+			{
+				feature_max[i]=max(feature_max[i],0);
+				feature_min[i]=min(feature_min[i],0);
+			}
+			
+			feature_max[index]=max(feature_max[index],value);
+			feature_min[index]=min(feature_min[index],value);
+
+			SKIP_ELEMENT
+			next_index=index+1;
+		}		
+
+		for(i=next_index;i<=max_index;i++)
+		{
+			feature_max[i]=max(feature_max[i],0);
+			feature_min[i]=min(feature_min[i],0);
+		}	
+	}
+
+	rewind(fp);
+
+	/* pass 2.5: save/restore feature_min/feature_max */
+	
+	if(restore_filename)
+	{
+		/* fp_restore rewinded in finding max_index */
+		int idx, c;
+		double fmin, fmax;
+		int next_index = 1;
+		
+		if((c = fgetc(fp_restore)) == 'y')
+		{
+			if(fscanf(fp_restore, "%lf %lf\n", &y_lower, &y_upper) != 2 ||
+			   fscanf(fp_restore, "%lf %lf\n", &y_min, &y_max) != 2)
+				return clean_up(fp_restore, fp, "ERROR: failed to read scaling parameters\n");
+			y_scaling = 1;
+		}
+		else
+			ungetc(c, fp_restore);
+
+		if (fgetc(fp_restore) == 'x') 
+		{
+			if(fscanf(fp_restore, "%lf %lf\n", &lower, &upper) != 2)
+				return clean_up(fp_restore, fp, "ERROR: failed to read scaling parameters\n");
+			while(fscanf(fp_restore,"%d %lf %lf\n",&idx,&fmin,&fmax)==3)
+			{
+				for(i = next_index;i<idx;i++)
+					if(feature_min[i] != feature_max[i])
+						fprintf(stderr,
+							"WARNING: feature index %d appeared in file %s was not seen in the scaling factor file %s.\n",
+							i, argv[argc-1], restore_filename);
+
+				feature_min[idx] = fmin;
+				feature_max[idx] = fmax;
+
+				next_index = idx + 1;
+			}
+			
+			for(i=next_index;i<=max_index;i++)
+				if(feature_min[i] != feature_max[i])
+					fprintf(stderr,
+						"WARNING: feature index %d appeared in file %s was not seen in the scaling factor file %s.\n",
+						i, argv[argc-1], restore_filename);
+		}
+		fclose(fp_restore);
+	}
+
+	if(save_filename)
+	{
+		FILE *fp_save = fopen(save_filename,"w");
+		if(fp_save==NULL)
+		{
+			fprintf(stderr,"can't open file %s\n", save_filename);
+			exit(1);
+		}
+		if(y_scaling)
+		{
+			fprintf(fp_save, "y\n");
+			fprintf(fp_save, "%.16g %.16g\n", y_lower, y_upper);
+			fprintf(fp_save, "%.16g %.16g\n", y_min, y_max);
+		}
+		fprintf(fp_save, "x\n");
+		fprintf(fp_save, "%.16g %.16g\n", lower, upper);
+		for(i=1;i<=max_index;i++)
+		{
+			if(feature_min[i]!=feature_max[i])
+				fprintf(fp_save,"%d %.16g %.16g\n",i,feature_min[i],feature_max[i]);
+		}
+
+		if(min_index < 1)
+			fprintf(stderr,
+				"WARNING: scaling factors with indices smaller than 1 are not stored to the file %s.\n", save_filename);
+
+		fclose(fp_save);
+	}
+	
+	/* pass 3: scale */
+	while(readline(fp)!=NULL)
+	{
+		char *p=line;
+		int next_index=1;
+		double target;
+		double value;
+		
+		if (sscanf(p,"%lf",&target) != 1)
+			return clean_up(NULL, fp, "ERROR: failed to read labels\n");
+		output_target(target);
+
+		SKIP_TARGET
+
+		while(sscanf(p,"%d:%lf",&index,&value)==2)
+		{
+			for(i=next_index;i<index;i++)
+				output(i,0);
+			
+			output(index,value);
+
+			SKIP_ELEMENT
+			next_index=index+1;
+		}		
+
+		for(i=next_index;i<=max_index;i++)
+			output(i,0);
+
+		printf("\n");
+	}
+
+	if (new_num_nonzeros > num_nonzeros)
+		fprintf(stderr, 
+			"WARNING: original #nonzeros %ld\n"
+			"       > new      #nonzeros %ld\n"
+			"If feature values are non-negative and sparse, use -l 0 rather than the default -l -1\n",
+			num_nonzeros, new_num_nonzeros);
+
+	free(line);
+	free(feature_max);
+	free(feature_min);
+	fclose(fp);
+	return 0;
+}
+
+char* readline(FILE *input)
+{
+	int len;
+	
+	if(fgets(line,max_line_len,input) == NULL)
+		return NULL;
+
+	while(strrchr(line,'\n') == NULL)
+	{
+		max_line_len *= 2;
+		line = (char *) realloc(line, max_line_len);
+		len = (int) strlen(line);
+		if(fgets(line+len,max_line_len-len,input) == NULL)
+			break;
+	}
+	return line;
+}
+
+void output_target(double value)
+{
+	if(y_scaling)
+	{
+		if(value == y_min)
+			value = y_lower;
+		else if(value == y_max)
+			value = y_upper;
+		else value = y_lower + (y_upper-y_lower) *
+			     (value - y_min)/(y_max-y_min);
+	}
+	printf("%g ",value);
+}
+
+void output(int index, double value)
+{
+	/* skip single-valued attribute */
+	if(feature_max[index] == feature_min[index])
+		return;
+
+	if(value == feature_min[index])
+		value = lower;
+	else if(value == feature_max[index])
+		value = upper;
+	else
+		value = lower + (upper-lower) * 
+			(value-feature_min[index])/
+			(feature_max[index]-feature_min[index]);
+
+	if(value != 0)
+	{
+		printf("%d:%g ",index, value);
+		new_num_nonzeros++;
+	}
+}
+
+int clean_up(FILE *fp_restore, FILE *fp, const char* msg)
+{
+	fprintf(stderr,	"%s", msg);
+	free(line);
+	free(feature_max);
+	free(feature_min);
+	fclose(fp);
+	if (fp_restore)
+		fclose(fp_restore);
+	return -1;
+}
+