#include <iostream>
#include <vector>
using namespace std;
using Graph = vector<vector<int>>;

// 深さ優先探索
int seen[100010], seen2[100010];
bool dfs(const Graph &G, const Graph &G_, const Graph &G2, const Graph &G2_, int v, bool HonLia) {
    bool flag = false; //矛盾が生じたか
    if (HonLia == true) seen[v] = 2;
    else seen[v] = 1;
    for (auto next_v : G[v]) { 
        if (seen[next_v] >= 1){
            if (HonLia == true && seen[next_v] == 1) flag = true;
            if (HonLia == false && seen[next_v] == 2) flag = true;
            continue;
        }
        if (HonLia == true) {if (dfs(G, G_, G2, G2_, next_v, true) == true) flag = true;} // 再帰的に探索
        else {if (dfs(G, G_, G2, G2_, next_v, false) == true) flag = true;} // 再帰的に探索
    }
    for (auto next_v : G_[v]) { 
        if (seen[next_v] >= 1){
            if (HonLia == true && seen[next_v] == 2) flag = true;
            if (HonLia == false && seen[next_v] == 1) flag = true;
            continue;
        }
        if (HonLia == true) {if (dfs(G, G_, G2, G2_, next_v, false) == true) flag = true;} // 再帰的に探索
        else {if (dfs(G, G_, G2, G2_, next_v, true) == true) flag = true;} // 再帰的に探索
    }
    for (auto next_v : G2[v]) { 
        if (seen[next_v] >= 1){
            if (HonLia == true && seen[next_v] == 1) flag = true;
            if (HonLia == false && seen[next_v] == 2) flag = true;
            continue;
        }
        if (HonLia == true) {if (dfs(G, G_, G2, G2_, next_v, true) == true) flag = true;} // 再帰的に探索
        else {if (dfs(G, G_, G2, G2_, next_v, false) == true) flag = true;} // 再帰的に探索
    }
    for (auto next_v : G2_[v]) { 
        if (seen[next_v] >= 1){
            if (HonLia == true && seen[next_v] == 2) flag = true;
            if (HonLia == false && seen[next_v] == 1) flag = true;
            continue;
        }
        if (HonLia == true) {if (dfs(G, G_, G2, G2_, next_v, false) == true) flag = true;} // 再帰的に探索
        else {if (dfs(G, G_, G2, G2_, next_v, true) == true) flag = true;} // 再帰的に探索
    }
    return flag;
}
bool dfs2(const Graph &G, const Graph &G_, const Graph &G2, const Graph &G2_, int v, bool HonLia) {
    bool flag = false; //矛盾が生じたか
    if (HonLia == true) seen2[v] = 2;
    else seen2[v] = 1;
    for (auto next_v : G[v]) { 
        if (seen2[next_v] >= 1){
            if (HonLia == true && seen2[next_v] == 1) flag = true;
            if (HonLia == false && seen2[next_v] == 2) flag = true;
            continue;
        }
        if (HonLia == true) {if (dfs2(G, G_, G2, G2_, next_v, true) == true) flag = true;} // 再帰的に探索
        else {if (dfs2(G, G_, G2, G2_, next_v, false) == true) flag = true;} // 再帰的に探索
    }
    for (auto next_v : G_[v]) { 
        if (seen2[next_v] >= 1){
            if (HonLia == true && seen2[next_v] == 2) flag = true;
            if (HonLia == false && seen2[next_v] == 1) flag = true;
            continue;
        }
        if (HonLia == true) {if (dfs2(G, G_, G2, G2_, next_v, false) == true) flag = true;} // 再帰的に探索
        else {if (dfs2(G, G_, G2, G2_, next_v, true) == true) flag = true;} // 再帰的に探索
    }
    for (auto next_v : G2[v]) { 
        if (seen2[next_v] >= 1){
            if (HonLia == true && seen2[next_v] == 1) flag = true;
            if (HonLia == false && seen2[next_v] == 2) flag = true;
            continue;
        }
        if (HonLia == true) {if (dfs2(G, G_, G2, G2_, next_v, true) == true) flag = true;} // 再帰的に探索
        else {if (dfs2(G, G_, G2, G2_, next_v, false) == true) flag = true;} // 再帰的に探索
    }
    for (auto next_v : G2_[v]) { 
        if (seen2[next_v] >= 1){
            if (HonLia == true && seen2[next_v] == 2) flag = true;
            if (HonLia == false && seen2[next_v] == 1) flag = true;
            continue;
        }
        if (HonLia == true) {if (dfs2(G, G_, G2, G2_, next_v, false) == true) flag = true;} // 再帰的に探索
        else {if (dfs2(G, G_, G2, G2_, next_v, true) == true) flag = true;} // 再帰的に探索
    }
    return flag;
}

int main() {
    // 頂点数と辺数
    int N, Q; cin >> N >> Q;

    // グラフ入力受取
    Graph G(N), G_(N), G2(N), G2_(N);
    for (int i = 0; i < Q; ++i) {
        int a, b, c;
        cin >> a >> b >> c;
        if (a == b) cout << -1 << endl;
        if (c == 0) G[a - 1].push_back(b - 1);
        if (c == 1) G_[a - 1].push_back(b - 1);
        if (c == 0) G2[b - 1].push_back(a - 1);
        if (c == 1) G2_[b - 1].push_back(a - 1);
    }

    // 全頂点が訪問済みになるまで探索
    long long ans = 1;
    for (int i = 0; i < N; i++) seen[i] = seen2[i] = 0;
    for (int v = 0; v < N; ++v) {
        if (seen[v] >= 1) continue; // v が探索済みだったらスルー
        long long count = 0;
        if (dfs(G, G_, G2, G2_, v, true) == false) count++; // v が未探索なら v を始点とした DFS を行う
        if (dfs2(G, G_, G2, G2_, v, false) == false) count++; // v が未探索なら v を始点とした DFS を行う
        ans = (ans * count) % 1000000007;
    }
    cout << ans << endl;
}