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/*
Copyright (c) 2008 - Chris Buckley.
Permission is granted for use and modification of this file for
research, non-commercial purposes.
*/
#include "common.h"
#include "sysfunc.h"
#include "trec_eval.h"
#include "trec_format.h"
#include <ctype.h>
/* Exactly the same as get_prefs.c except it reads a standard
TREC qrels file as if it were a prefs file, associating
JG with the iter field, and assigning JSG a constant '0'
for all lines. This normally will yield a single JG and
a single JSG per query, with two levels of relevance if
it is a binary relevance file, and more if a multiple
relevance file.
Read all relevance preference information from text_qrels_prefs_file.
Preferences of user(s) for docs for a given qid is determined from
text_prefs_file, which consists of text tuples of the form
qid ujg docno rel_level
giving TREC document numbers (docno, a string) and their relevance
level (rel_level,a non-negative float) to query qid (a string) for a
user judgment group (ujg, a string).
Fields are separated by whitespace, string fields can contain no whitespace.
File may contain no NULL characters.
Preferences are indicated indirectly by comparing rel_level of
different docnos within the same user judgment group(JG). A
judgment group establishes preferences between all docnos with
non-tied rel_levels within the group. Except possibly for 0.0, the
actual values of rel_level are ignored by default; they only serve to
establish a ranking within the JSG.
If a user only expresses a preference between two docs, then that user JSG
will have 2 lines in text_prefs_file:
qid1 ujg1 docno1 3.0
qid1 ujg1 docno2 2.0
If a user completely ranks some small number N (5-10) of docs, then N lines
are used.
For example:
qid1 ujg1 docno1 3.0
qid1 ujg1 docno2 2.0
qid1 ujg1 docno3 0.0
qid1 ujg1 docno4 6.0
qid1 ujg1 docno5 0.0
qid1 ujg1 docno6 2.0
establishes a total of 13 preferences (5 with docno4 preferred, 4 with docno1
preferred, 2 each with docno2 and docno6 preferred).
A Judgment Group (JG) conceptually represents preferences for a single
information need of a user at a single time. Within a single JG, it
is an error if there are inconsistencies (doc A > doc B in one JSG,
but B > A or B == A in another).
Different JGs may contain contradictory preferences, These
disagreements are realistic and desirable: users (or even the same
user at different times) often do not agree with each other's
preferences. Individual preference evaluation measures will handle
these contradictions (or confirmations) in different ways.
A rel_level of 0.0 by convention means that doc is non-relevant to the
topic (in that user's opinion). Some preference evaluation measures
may handle 0.0 differently. Thus when converting a preference file in
some other format into text_prefs format, do not assign a rel_level of
0.0 to a docno unless it is known that docno was considered
nonrelevant.
Handling of rel_level 0.0 separately addresses the general problem
that the number of nonrelevant docs judged for a topic can be critical
to fair evaluation - adding a couple of hundred preferences involving
nonrelevant docs (out of the possibly millions or billions in a
collection) can both change the importance of the topic when averaging
and even change whether system A scores better than system B on a
topic (even given identical retrieval on the added nonrel docs). How
to handle this correctly for preference evaluation will be an
important future research problem.
*/
static int parse_qrels_prefs_line (char **start_ptr, char **qid_ptr,
char **jg_ptr, char **docno_ptr,
char **rel_ptr);
static int comp_lines_qid_docno ();
/* static pools of memory, allocated here and never changed.
Declared static so one day I can write a cleanup procedure to free them */
static char *trec_prefs_buf = NULL;
static TEXT_PREFS_INFO *text_info_pool = NULL;
static TEXT_PREFS *text_prefs_pool = NULL;
static REL_INFO *rel_info_pool = NULL;
/* Temp structure for values in input line */
typedef struct {
char *qid;
char *jg;
char *docno;
char *rel;
} LINES;
int
te_get_qrels_prefs (EPI *epi, char *text_prefs_file, ALL_REL_INFO *all_rel_info)
{
int fd;
int size = 0;
char *ptr;
char *current_qid;
long i;
LINES *lines;
LINES *line_ptr;
long num_lines;
long num_qid;
/* current pointers into static pools above */
REL_INFO *rel_info_ptr;
TEXT_PREFS_INFO *text_info_ptr;
TEXT_PREFS *text_prefs_ptr;
/* Read entire file into memory */
if (-1 == (fd = open (text_prefs_file, 0)) ||
0 >= (size = lseek (fd, 0L, 2)) ||
NULL == (trec_prefs_buf = malloc ((unsigned) size+2)) ||
-1 == lseek (fd, 0L, 0) ||
size != read (fd, trec_prefs_buf, size) ||
-1 == close (fd)) {
fprintf (stderr,
"trec_eval.get_prefs: Cannot read prefs file '%s'\n",
text_prefs_file);
return (UNDEF);
}
/* Append ending newline if not present, Append NULL terminator */
if (trec_prefs_buf[size-1] != '\n') {
trec_prefs_buf[size] = '\n';
size++;
}
trec_prefs_buf[size] = '\0';
/* Count number of lines in file */
num_lines = 0;
for (ptr = trec_prefs_buf; *ptr; ptr = index(ptr,'\n')+1)
num_lines++;
/* Get all lines */
if (NULL == (lines = Malloc (num_lines, LINES)))
return (UNDEF);
line_ptr = lines;
ptr = trec_prefs_buf;
while (*ptr) {
if (UNDEF == parse_qrels_prefs_line (&ptr, &line_ptr->qid,&line_ptr->jg,
&line_ptr->docno, &line_ptr->rel)){
fprintf (stderr, "trec_eval.get_qrels_prefs: Malformed line %ld\n",
(long) (line_ptr - lines + 1));
return (UNDEF);
}
line_ptr++;
}
num_lines = line_ptr-lines;
/* Sort all lines by qid, then docno */
qsort ((char *) lines,
(int) num_lines,
sizeof (LINES),
comp_lines_qid_docno);
/* Go through lines and count number of qid */
num_qid = 1;
for (i = 1; i < num_lines; i++) {
if (strcmp (lines[i-1].qid, lines[i].qid))
/* New query */
num_qid++;
}
/* Allocate space for queries */
if (NULL == (rel_info_pool = Malloc (num_qid, REL_INFO)) ||
NULL == (text_info_pool = Malloc (num_qid, TEXT_PREFS_INFO)) ||
NULL == (text_prefs_pool = Malloc (num_lines, TEXT_PREFS)))
return (UNDEF);
rel_info_ptr = rel_info_pool;
text_info_ptr = text_info_pool;
text_prefs_ptr = text_prefs_pool;
/* Go through lines and store all info */
current_qid = "";
for (i = 0; i < num_lines; i++) {
if (strcmp (current_qid, lines[i].qid)) {
/* New query. End old query and start new one */
if (i != 0) {
text_info_ptr->num_text_prefs =
text_prefs_ptr - text_info_ptr->text_prefs;
text_info_ptr++;
rel_info_ptr++;
}
current_qid = lines[i].qid;
text_info_ptr->text_prefs = text_prefs_ptr;
*rel_info_ptr =
(REL_INFO) {current_qid, "prefs", text_info_ptr};
}
text_prefs_ptr->jg = lines[i].jg;
text_prefs_ptr->jsg = "0";
text_prefs_ptr->rel_level = atof (lines[i].rel);
text_prefs_ptr->docno = lines[i].docno;
text_prefs_ptr++;
}
/* End last qid */
text_info_ptr->num_text_prefs = text_prefs_ptr - text_info_ptr->text_prefs;
all_rel_info->num_q_rels = num_qid;
all_rel_info->rel_info = rel_info_pool;
Free (lines);
return (1);
}
static int comp_lines_qid_docno (LINES *ptr1, LINES *ptr2)
{
int cmp = strcmp (ptr1->qid, ptr2->qid);
if (cmp) return (cmp);
return (strcmp (ptr1->docno, ptr2->docno));
}
static int
parse_qrels_prefs_line (char **start_ptr, char **qid_ptr, char**jg_ptr,
char **docno_ptr, char **rel_ptr)
{
char *ptr = *start_ptr;
/* Get qid */
while (*ptr != '\n' && isspace (*ptr)) ptr++;
*qid_ptr = ptr;
while (! isspace (*ptr)) ptr++;
if (*ptr == '\n') return (UNDEF);
*ptr++ = '\0';
/* Get Judgment Group */
while (*ptr != '\n' && isspace (*ptr)) ptr++;
*jg_ptr = ptr;
while (! isspace (*ptr)) ptr++;
if (*ptr == '\n') return (UNDEF);
*ptr++ = '\0';
/* Get docno */
while (*ptr != '\n' && isspace (*ptr)) ptr++;
*docno_ptr = ptr;
while (! isspace (*ptr)) ptr++;
if (*ptr == '\n') return (UNDEF);
*ptr++ = '\0';
/* Get relevance */
while (*ptr != '\n' && isspace (*ptr)) ptr++;
if (*ptr == '\n') return (UNDEF);
*rel_ptr = ptr;
while (! isspace (*ptr)) ptr++;
if (*ptr != '\n') {
*ptr++ = '\0';
while (*ptr != '\n' && isspace (*ptr)) ptr++;
if (*ptr != '\n') return (UNDEF);
}
*ptr++ = '\0';
*start_ptr = ptr;
return (0);
}
int
te_get_qrels_prefs_cleanup ()
{
if (trec_prefs_buf != NULL) {
Free (trec_prefs_buf);
trec_prefs_buf = NULL;
}
if (text_info_pool != NULL) {
Free (text_info_pool);
text_info_pool = NULL;
}
if (text_prefs_pool != NULL) {
Free (text_prefs_pool);
text_prefs_pool = NULL;
}
if (rel_info_pool != NULL) {
Free (rel_info_pool);
rel_info_pool = NULL;
}
return (1);
}
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