#include <bits/stdc++.h>
using namespace std;
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii ;
typedef pair<ll, ll> pll ;
typedef vector<pii> vii ;
typedef vector<int> veci ;
typedef vector<pll> vll ;
typedef vector<ll> vecll;
// find_by_order order_of_key
//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define F first
#define S second
#define pb push_back
#define endl '\n'
#define Mp make_pair
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " = " << x << endl
#define set_dec(x) cout << fixed << setprecision(x);
#define fast_io ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io freopen("in.txt" , "r" , stdin) ; freopen("out.txt" , "w" , stdout);
#define lb lower_bound
#define ub upper_bound
#define for1(n) for(int i=1;i<=n;i++)
#define for0(n) for(int i=0;i<n;i++)
#define forn(n) for(int i=n;i>0;i--)
#define pq priority_queue <pii, vector<pii>, greater<pii>>
const int N=1e3+3;
int n,m,k;
vector<int>gg[N];
vector<int>vec,ans;
deque<int>g[N];
pair<pii,int>A[N];
map<int,int>vis[N];
void get_ans(int tt){
for(tt--;tt<vec.size();tt++)ans.pb(vec[tt]);
}
void dfs(int v,int c){
vis[v][c]=vec.size()+1;
for(int i:gg[v]){
// int i=g[v].back();
if(A[i].S!=c){
vec.pb(i);
if(vis[A[i].F.S][A[i].S]==0)
dfs(A[i].F.S,A[i].S);
else if(vis[A[i].F.S][A[i].S]!=-1 && ans.size()==0){
get_ans(vis[A[i].F.S][A[i].S]);
}
// if(g[v].size() && g[v].back()==i)
// g[v].pop_front();
vec.pop_back();
continue;
}
// i=g[v].front();
// if(A[i].S!=c){
// vec.pb(i);
// if(vis[A[i].F.S][A[i].S]==0)
// dfs(A[i].F.S,A[i].S);
// else if(vis[A[i].F.S][A[i].S]!=-1 && ans.size()==0)
// get_ans(vis[A[i].F.S][A[i].S]);
// if(g[v].size() && g[v].front()==i)
// g[v].pop_front();
// vec.pop_back();
// continue;
// }
// break;
}
vis[v][c]=-1;
}
int main(){
fast_io
int T;cin>>T;
while(T--){
cin>>n>>m;
for1(m){
int u,v,c;cin>>u>>v>>c;
A[i]={{u,v},c};
gg[u].pb(i);
}
for1(n){
sort(all(gg[i]));
for(int x:gg[i])g[i].pb(x);
}
for1(m)if(vis[A[i].F.S][A[i].S]==0)dfs(A[i].F.S,A[i].S);
if(ans.size()){
cout<<"YES\n";
cout<<ans.size()<<" ";
for(int x:ans)cout<<x<<" ";cout<<endl;
}
else
cout<<"NO\n";
for1(n){
vis[i].clear();
gg[i].clear();
g[i].clear();
}
ans.clear();
}
}
