# -*- coding: utf-8 -*-
"""Untitled12.ipynb

Automatically generated by Colaboratory.

Original file is located at
    https://colab.research.google.com/drive/1ia944iiX5i5KOxESwbcHksNJrG4L12U6
"""

!pip install torch regexp pandas

!git clone --single-branch git://gonito.net/challenging-america-word-gap-prediction -b master

!xzcat ./challenging-america-word-gap-prediction/train/in.tsv.xz > ./challenging-america-word-gap-prediction/train/in.tsv

!xzcat ./challenging-america-word-gap-prediction/dev-0/in.tsv.xz > ./challenging-america-word-gap-prediction/dev-0/in.tsv

!xzcat ./challenging-america-word-gap-prediction/test-A/in.tsv.xz > ./challenging-america-word-gap-prediction/test-A/in.tsv

import pandas as pd

def read_train_data(file):
    data = pd.read_csv(file, sep="\t", error_bad_lines=False, index_col=0, header=None)
    with open('input_train.txt', 'w') as f:
        for index, row in data[:500000].iterrows():
            first_part = str(row[6]).replace('\\n', '')
            sec_part = str(row[7]).replace('\\n', '')
            if first_part != 'nan':
                f.write(first_part + '\n')
            if sec_part != 'nan':
                f.write(sec_part + '\n')

read_train_data('./challenging-america-word-gap-prediction/train/in.tsv')

!head -10 input_train.txt

from itertools import islice
  import regex as re
  import sys
  from torchtext.vocab import build_vocab_from_iterator


  def get_words_from_line(line):
    line = line.rstrip()
    yield '<s>'
    for m in re.finditer(r'[\p{L}0-9\*]+|\p{P}+', line):
       yield m.group(0).lower()
    yield '</s>'


  def get_word_lines_from_file(file_name):
    with open(file_name, 'r') as fh:
      for line in fh:
         yield get_words_from_line(line)

  vocab_size = 30000

  vocab = build_vocab_from_iterator(
      get_word_lines_from_file('input_train.txt'),
      max_tokens = vocab_size,
      specials = ['<unk>'])

vocab['is']

print(vocab['is'])

from torch import nn
  import torch

  embed_size = 100

  class SimpleBigramNeuralLanguageModel(nn.Module):
    def __init__(self, vocabulary_size, embedding_size):
        super(SimpleBigramNeuralLanguageModel, self).__init__()
        self.model = nn.Sequential(
            nn.Embedding(vocabulary_size, embedding_size),
            nn.Linear(embedding_size, vocabulary_size),
            nn.Softmax()
        )

    def forward(self, x):
        return self.model(x)

  model = SimpleBigramNeuralLanguageModel(vocab_size, embed_size)

  vocab.set_default_index(vocab['<unk>'])

!shuf < input_train.txt > input_train.shuf.txt

from torch.utils.data import IterableDataset
import itertools

def look_ahead_iterator(gen):
    prev = None
    for item in gen:
      if prev is not None:
          yield (prev, item)
      prev = item

class Bigrams(IterableDataset):
  def __init__(self, text_file, vocabulary_size):
      self.vocab = build_vocab_from_iterator(
          get_word_lines_from_file(text_file),
          max_tokens = vocabulary_size,
          specials = ['<unk>'])
      self.vocab.set_default_index(self.vocab['<unk>'])
      self.vocabulary_size = vocabulary_size
      self.text_file = text_file

  def __iter__(self):
      return look_ahead_iterator(
          (self.vocab[t] for t in itertools.chain.from_iterable(get_word_lines_from_file(self.text_file))))

train_dataset = Bigrams('input_train.shuf.txt', vocab_size)

from torch.utils.data import DataLoader


device = 'cuda'
model = SimpleBigramNeuralLanguageModel(vocab_size, embed_size).to(device)
data = DataLoader(train_dataset, batch_size=5000)
optimizer = torch.optim.Adam(model.parameters())
criterion = torch.nn.NLLLoss()

model.train()
step = 0
for x, y in data:
    x = x.to(device)
    y = y.to(device)
    optimizer.zero_grad()
    ypredicted = model(x)
    loss = criterion(torch.log(ypredicted), y)
    if step % 100 == 0:
      print(step, loss)
    step += 1
    loss.backward()
    optimizer.step()

torch.save(model.state_dict(), 'model1.bin')

device = 'cuda'
model = SimpleBigramNeuralLanguageModel(vocab_size, embed_size).to(device)
model.load_state_dict(torch.load('model1.bin'))
model.eval()

ixs = torch.tensor(vocab.forward(['he'])).to(device)

out = model(ixs)
top = torch.topk(out[0], 10)
top_indices = top.indices.tolist()
top_probs = top.values.tolist()
top_words = vocab.lookup_tokens(top_indices)
list(zip(top_words, top_indices, top_probs))

import regex as re

def predict_word(word):
  device = 'cuda'
  model = SimpleBigramNeuralLanguageModel(vocab_size, embed_size).to(device)
  model.load_state_dict(torch.load('model1.bin'))
  model.eval()

  ixs = torch.tensor(vocab.forward([word])).to(device)

  out = model(ixs)
  top = torch.topk(out[0], 8)
  top_indices = top.indices.tolist()
  top_probs = top.values.tolist()
  top_words = vocab.lookup_tokens(top_indices)
  to_return = ''
  total = 1.0
  for el in list(zip(top_words, top_indices, top_probs)):
    pattern = re.compile("^([A-Za-z0-9])+$")
    if re.match(pattern, el[0]):
      if total - top_probs[0] >= 0:
        to_return += f'{el[0]}:{top_probs[0]} '
        total -= top_probs[0]
  if total != 1.0:
    to_return += f':{total}'
  return to_return

!pip install nltk

from nltk.tokenize import RegexpTokenizer
tokenizer = RegexpTokenizer(r"\w+")

import csv

def generate_outputs(input_file, output_file):
    data = pd.read_csv(input_file, sep='\t', error_bad_lines=False, index_col=0, header=None, quoting=csv.QUOTE_NONE)
    with open(output_file, 'w') as f:
        for index, row in data.iterrows():
            first_context = row[6]
            sec_context = row[7]
            first_context_tokens = tokenizer.tokenize(first_context)
            sec_context_tokens = tokenizer.tokenize(sec_context)
            if len(first_context_tokens) + len(sec_context_tokens) < 4:
                prediction = 'the:0.2 be:0.2 to:0.2 of:0.1 and:0.1 a:0.1 :0.1'
            else:
                prediction = predict_word(first_context_tokens[-1])
                if not prediction:
                  prediction = 'the:0.2 be:0.2 to:0.2 of:0.1 and:0.1 a:0.1 :0.1'
            f.write(prediction + '\n')

generate_outputs('./challenging-america-word-gap-prediction/dev-0/in.tsv', './challenging-america-word-gap-prediction/dev-0/out.tsv')
generate_outputs('./challenging-america-word-gap-prediction/test-A/in.tsv', './challenging-america-word-gap-prediction/test-A/out.tsv')

!wget https://gonito.net/get/bin/geval

!chmod u+x geval

!./geval -t ./challenging-america-word-gap-prediction/dev-0/ --metric PerplexityHashed