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Charades_v1_localize.m
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Charades_v1_localize.m
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function [rec_all,prec_all,ap_all,map]=Charades_v1_localize(clsfilename,gtpath)
%
% Input: clsfilename: path of the input file
% gtpath: the path of the groundtruth file
%
% Output: rec_all: recall
% prec_all: precision
% ap_all: AP for each class
% map: MAP
%
% Please refer to the README.txt file for an overview of how localization performance is evaluated
%
% Example:
%
% [rec_all,prec_all,ap_all,map]=Charades_v1_localize('test_submission.txt','Charades_v1_test.csv');
%
% Code adapted from THUMOS15
%
tic;
fprintf('Loading Charades Annotations:\n');
frames_per_video = 25;
[gtids,gtclasses] = load_charades_localized(gtpath,frames_per_video);
nclasses = 157;
ntest = length(gtids);
toc; tic;
% load test scores
fprintf('Reading Submission File:\n');
[testids,framenr,testscores]=textread(clsfilename,'%s%d%[^\n]');
if min(framenr)==0
fprintf('Warning: Frames should be 1 indexed\n');
fprintf('Warning: Adding 1 to all frames numbers\n');
framenr = framenr+1;
end
toc; tic;
fprintf('Parsing Submission Scores:\n');
nInputNum=size(testscores,1);
if nInputNum<ntest
fprintf('Warning: %d Total frames missing\n',ntest-nInputNum);
end
testscoresparsed = cellfun(@str2num,testscores,'UniformOutput',false);
eleNum=length(testscoresparsed{1});
if eleNum~=nclasses&&eleNum~=nclasses+1
fprintf('Error: Incompatible number of classes\n');
end
make_frameid = @(x,y) [x,'-',sprintf('%03d',y)];
frameids = cellfun(make_frameid,testids,num2cell(framenr),'UniformOutput',false);
predictions = containers.Map(frameids,testscoresparsed);
toc; tic;
% compare test scores to ground truth
fprintf('Constructing Ground Truth Matrix:\n')
gtlabel = zeros(ntest,nclasses);
test = -inf(ntest,nclasses);
for i=1:ntest
id = gtids{i};
gtlabel(i,gtclasses{i}+1) = 1;
if predictions.isKey(id)
test(i,:) = predictions(id);
end
end
toc; tic;
for i=1:nclasses
[rec_all(:,i),prec_all(:,i),ap_all(:,i)]=THUMOSeventclspr(test(:,i),gtlabel(:,i));
end
map=mean(ap_all);
wap=sum(ap_all.*sum(gtlabel,1))/sum(gtlabel(:));
fprintf('\n\n')
fprintf('Per-Frame MAP: %f\n',map);
fprintf('Per-Frame WAP: %f (weighted by size of each class)',wap);
fprintf('\n\n')
function [rec,prec,ap]=THUMOSeventclspr(conf,labels)
[so,sortind]=sort(-conf);
tp=labels(sortind)==1;
fp=labels(sortind)~=1;
npos=length(find(labels==1));
% compute precision/recall
fp=cumsum(fp);
tp=cumsum(tp);
rec=tp/npos;
prec=tp./(fp+tp);
% compute average precision
ap=0;
tmp=labels(sortind)==1;
for i=1:length(conf)
if tmp(i)==1
ap=ap+prec(i);
end
end
ap=ap/npos;
function [gtids,gtclasses] = load_charades_localized(gtpath,frames_per_video)
% Loads the ground truth annotations from the csv file
f = fopen(gtpath);
% read column headers
headerline = textscan(f,'%s',1);
headerline = regexp(headerline{1}{1},',','split');
ncols = length(headerline);
headers = struct();
for i=1:ncols
headers = setfield(headers,headerline{i},i);
end
% read data
gtcsv = textscan(f,repmat('%q ',[1 ncols]),'Delimiter',',');
fclose(f);
ntest = size(gtcsv{1},1);
framechar = char(cellfun(@(x) sprintf('%03d',x),num2cell((1:50)'),'UniformOutput',false')); %for speed
gtids = cell(frames_per_video*ntest,1);
gtclasses = cell(frames_per_video*ntest,1);
uncell = @(x) x{1};
c = 1;
for i=1:ntest
id = gtcsv{headers.id}{i};
classes = gtcsv{headers.actions}{i};
time = str2double(gtcsv{headers.length}{i});
if strcmp(classes,'')
missing = true;
else
missing = false;
classes = regexp(classes,';','split')';
classes = cellfun(@(x) uncell(textscan(x,'c%f %f %f','CollectOutput',true)), classes,'UniformOutput',false); %for speed
classes = cell2mat(classes);
% classes is C by 3 matrix where each row is [class start end] for an action
end
for j=1:frames_per_video
frameclasses = zeros(50,1); %for speed
fc = 1;
timepoint = (j-1)/frames_per_video*time;
for k=1:size(classes,1)
if missing; continue; end
if (classes(k,2) <= timepoint) && (timepoint <= classes(k,3))
frameclasses(fc) = classes(k,1);
fc = fc+1;
end
end
frameid = [id,'-',framechar(j,:)]; %for speed
gtids{c} = frameid;
gtclasses{c} = frameclasses(1:(fc-1));
c = c+1;
end
end
gtids = gtids(1:c-1);
gtclasses = gtclasses(1:c-1);