// Copyright 2013 Google Inc. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include <stdio.h>

#include <string.h>

#include <math.h>

#include <malloc.h>

const long long max_size = 2000; // max length of strings

const long long N = 40; // number of closest words that will be shown

const long long max_w = 50; // max length of vocabulary entries

int main(int argc, char **argv) {

FILE *f;

char st1[max_size];

char bestw[N][max_size];

char file_name[max_size], st[100][max_size];

float dist, len, bestd[N], vec[max_size];

long long words, size, a, b, c, d, cn, bi[100];

char ch;

float *M;

char *vocab;

if (argc < 2) {

printf("Usage: ./word-analogy <FILE>\nwhere FILE contains word projections in the BINARY FORMAT\n");

return 0;

}

strcpy(file_name, argv[1]);

f = fopen(file_name, "rb");

if (f == NULL) {

printf("Input file not found\n");

return -1;

}

fscanf(f, "%lld", &words);

fscanf(f, "%lld", &size);

vocab = (char *)malloc((long long)words * max_w * sizeof(char));

M = (float *)malloc((long long)words * (long long)size * sizeof(float));

if (M == NULL) {

printf("Cannot allocate memory: %lld MB %lld %lld\n", (long long)words * size * sizeof(float) / 1048576, words, size);

return -1;

}

for (b = 0; b < words; b++) {

a = 0;

while (1) {

vocab[b * max_w + a] = fgetc(f);

if (feof(f) || (vocab[b * max_w + a] == ' ')) break;

if ((a < max_w) && (vocab[b * max_w + a] != '\n')) a++;

}

vocab[b * max_w + a] = 0;

for (a = 0; a < size; a++) fread(&M[a + b * size], sizeof(float), 1, f);

len = 0;

for (a = 0; a < size; a++) len += M[a + b * size] * M[a + b * size];

len = sqrt(len);

for (a = 0; a < size; a++) M[a + b * size] /= len;

}

fclose(f);

while (1) {

for (a = 0; a < N; a++) bestd[a] = 0;

for (a = 0; a < N; a++) bestw[a][0] = 0;

printf("Enter three words (EXIT to break): ");

a = 0;

while (1) {

st1[a] = fgetc(stdin);

if ((st1[a] == '\n') || (a >= max_size - 1)) {

st1[a] = 0;

break;

}

a++;

}

if (!strcmp(st1, "EXIT")) break;

cn = 0;

b = 0;

c = 0;

while (1) {

st[cn][b] = st1[c];

b++;

c++;

st[cn][b] = 0;

if (st1[c] == 0) break;

if (st1[c] == ' ') {

cn++;

b = 0;

c++;

}

}

cn++;

if (cn < 3) {

printf("Only %lld words were entered.. three words are needed at the input to perform the calculation\n", cn);

continue;

}

for (a = 0; a < cn; a++) {

for (b = 0; b < words; b++) if (!strcmp(&vocab[b * max_w], st[a])) break;

if (b == words) b = 0;

bi[a] = b;

printf("\nWord: %s Position in vocabulary: %lld\n", st[a], bi[a]);

if (b == 0) {

printf("Out of dictionary word!\n");

break;

}

}

if (b == 0) continue;

printf("\n Word Distance\n------------------------------------------------------------------------\n");

for (a = 0; a < size; a++) vec[a] = M[a + bi[1] * size] - M[a + bi[0] * size] + M[a + bi[2] * size];

len = 0;

for (a = 0; a < size; a++) len += vec[a] * vec[a];

len = sqrt(len);

for (a = 0; a < size; a++) vec[a] /= len;

for (a = 0; a < N; a++) bestd[a] = 0;

for (a = 0; a < N; a++) bestw[a][0] = 0;

for (c = 0; c < words; c++) {

if (c == bi[0]) continue;

if (c == bi[1]) continue;

if (c == bi[2]) continue;

a = 0;

for (b = 0; b < cn; b++) if (bi[b] == c) a = 1;

if (a == 1) continue;

dist = 0;

for (a = 0; a < size; a++) dist += vec[a] * M[a + c * size];

for (a = 0; a < N; a++) {

if (dist > bestd[a]) {

for (d = N - 1; d > a; d--) {

bestd[d] = bestd[d - 1];

strcpy(bestw[d], bestw[d - 1]);

}

bestd[a] = dist;

strcpy(bestw[a], &vocab[c * max_w]);

break;

}

}

}

for (a = 0; a < N; a++) printf("%50s\t\t%f\n", bestw[a], bestd[a]);

}

return 0;

}