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# TarrySingh/Data Types Tuts.py Created Aug 4, 2017

Tarry-Tuts-Gists
 import matplotlib.pyplot as plt import numpy as np from scipy.stats import beta NUM_TRIALS = 2000 BANDIT_PROBABILITIES = [0.2, 0.5, 0.75] class Bandit(object): def __init__(self, p): self.p = p self.a = 1 self.b = 1 def pull(self): return np.random.random() < self.p def sample(self): return np.random.beta(self.a, self.b) def update(self, x): self.a += x self.b += 1 - x def plot(bandits, trial): x = np.linspace(0, 1, 200) for b in bandits: y = beta.pdf(x, b.a, b.b) plt.plot(x, y, label="real p: %.4f" % b.p) plt.title("Bandit distributions after %s trials" % trial) plt.legend() plt.show() def experiment(): bandits = [Bandit(p) for p in BANDIT_PROBABILITIES] sample_points = [5,10,20,50,100,200,500,1000,1500,1999] for i in range(NUM_TRIALS): # take a sample from each bandit bestb = None maxsample = -1 allsamples = [] # let's collect these just to print for debugging for b in bandits: sample = b.sample() allsamples.append("%.4f" % sample) if sample > maxsample: maxsample = sample bestb = b if i in sample_points: print("current samples: %s" % allsamples) plot(bandits, i) # pull the arm for the bandit with the largest sample x = bestb.pull() # update the distribution for the bandit whose arm we just pulled bestb.update(x) if __name__ == "__main__": experiment()
 def say(say_please=False): msg = 'Can you buy me a beer?' return msg, say_please print(say()) print(say(say_please=True)) if name == 'Tarry': print('Hello Tarry!') if password == 'swordfish': print
 import random chances = 0 print("Hi! What's your name?") myName = input() number = random.randint(1, 20) print('Well,' +myName+ ', I am thinking a number between 1 and 20.') while chances < 6: print('Take a guess.') guess = input() guess = int(guess) chances = chances + 1 if guess < number: print('Your guess is too low.') if guess > number: print('Your guess is too high!') if guess == number: break if guess == number: chances = str(chances +1) print('Awesome job,' + myName + '! You guessed my number in ' + chances + ' guesses!') if guess != number: number = str(number) print('Sorry, the number I was thinking of was '+ number)
 ######################################################## # Full exercise kit on http://www.practicepython.org # # # ######################################################## # / Some password generator example // ######################################################## # import string # print((string.ascii_letters)+ (string.punctuation)) # print(string.printable) # print(list(string.ascii_lowercase)) # Generate a password # help(string) for more info # Help on module string: # # NAME # string - A collection of string constants. # # MODULE REFERENCE # https://docs.python.org/3.6/library/string # # The following documentation is automatically generated from the Python # source files. It may be incomplete, incorrect or include features that # are considered implementation detail and may vary between Python # implementations. When in doubt, consult the module reference at the # location listed above. # # DESCRIPTION # Public module variables: # # whitespace -- a string containing all ASCII whitespace # ascii_lowercase -- a string containing all ASCII lowercase letters # ascii_uppercase -- a string containing all ASCII uppercase letters # ascii_letters -- a string containing all ASCII letters # digits -- a string containing all ASCII decimal digits # hexdigits -- a string containing all ASCII hexadecimal digits # octdigits -- a string containing all ASCII octal digits # punctuation -- a string containing all ASCII punctuation characters # printable -- a string containing all ASCII characters considered printable # # CLASSES # builtins.object # Formatter # Template # # class Formatter(builtins.object) # | Methods defined here: # | # | check_unused_args(self, used_args, args, kwargs) # | # | convert_field(self, value, conversion) # | # | format(*args, **kwargs) # | # | format_field(self, value, format_spec) # | # | get_field(self, field_name, args, kwargs) # | # given a field_name, find the object it references. # | # field_name: the field being looked up, e.g. "0.name" # | # or "lookup" # | # used_args: a set of which args have been used # | # args, kwargs: as passed in to vformat # | # | get_value(self, key, args, kwargs) # | # | parse(self, format_string) # | # returns an iterable that contains tuples of the form: # | # (literal_text, field_name, format_spec, conversion) # | # literal_text can be zero length # | # field_name can be None, in which case there's no # | # object to format and output # | # if field_name is not None, it is looked up, formatted # | # with format_spec and conversion and then used # | # | vformat(self, format_string, args, kwargs) # | # | ---------------------------------------------------------------------- # | Data descriptors defined here: # | # | __dict__ # | dictionary for instance variables (if defined) # | # | __weakref__ # | list of weak references to the object (if defined) # # class Template(builtins.object) # | A string class for supporting \$-substitutions. # | # | Methods defined here: # | # | __init__(self, template) # | Initialize self. See help(type(self)) for accurate signature. # | # | safe_substitute(*args, **kws) # | # | substitute(*args, **kws) # | # | ---------------------------------------------------------------------- # | Data descriptors defined here: # | # | __dict__ # | dictionary for instance variables (if defined) # | # | __weakref__ # | list of weak references to the object (if defined) # | # | ---------------------------------------------------------------------- # | Data and other attributes defined here: # | # | delimiter = '\$' # | # | flags = # | # | idpattern = '[_a-z][_a-z0-9]*' # | # | pattern = re.compile('\n \\\$(?:\n (?P\\\$)..._a-z][_a-... # # FUNCTIONS # capwords(s, sep=None) # capwords(s [,sep]) -> string # # Split the argument into words using split, capitalize each # word using capitalize, and join the capitalized words using # join. If the optional second argument sep is absent or None, # runs of whitespace characters are replaced by a single space # and leading and trailing whitespace are removed, otherwise # sep is used to split and join the words. # # DATA # __all__ = ['ascii_letters', 'ascii_lowercase', 'ascii_uppercase', 'cap... # ascii_letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' # ascii_lowercase = 'abcdefghijklmnopqrstuvwxyz' # ascii_uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' # digits = '0123456789' # hexdigits = '0123456789abcdefABCDEF' # octdigits = '01234567' # printable = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTU... # punctuation = '!"#\$%&\'()*+,-./:;<=>?@[\\]^_`{|}~' # whitespace = ' \t\n\r\x0b\x0c' # # FILE # /Users/tarrysingh/anaconda/lib/python3.6/string.py # Stackoverflow samples: https://stackoverflow.com/questions/16060899/alphabet-range-python ######################################################## # Example 1 - Password Generator ######################################################## # 1 - Basic example import random import string s = string.printable passlen = 8 p = "".join(random.sample(s,passlen)) print(p) # 2 - Somewhat more fun def pw_gen(size = 8, chars=string.printable): return ''.join(random.choice(chars) for _ in range(size)) # print('Password is '+ pw_gen()) print('Password is '+ pw_gen(int(input('How many characters in your password?')))) ######################################################## # Reverse word order solutions ######################################################## # 1 - Simple loop def reverse(x): y = x.split() result = [] for word in y: result.insert(0,word) return " ".join(result) test1 = input('Enter your sentence:' ) print(reverse(test1)) # 2 - A quick one-liner solution is like this def reverseSentence(x): return ''.join(x.split()[::-1]) enter = input('Your sentence goes here: ') print(reverseSentence(enter)) ######################################################## # Example 2 : Rock paper scissors game ######################################################## import sys user1 = input('What is your name?') user2 = input('and your name?') user1_answer = input('%s, do you want to choose rock, paper or scissors?' %user1) user2_answer = input('%s, do you want to choose rock, paper or scissors?' %user2) def compare(u1, u2): if u1 == u2: return("Tts s tie!") elif u1 =='rock': if u2 == 'scissors': return('Rock wins!') else: return('Paper wins!') elif u1 =='scissors': if u2 == 'paper': return('Scissors wins!') else: return('Rock wins!') elif u1 =='paper': if u2 == 'rock': return('Paper wins!') else: return('Scissors wins!') else: return("Incorrect niput! You must enter rock, paper or scissors. Try one more time") sys.exit() print(compare(user1_answer, user2_answer)) ######################################################## # Example 2 : Tic Tac toe ######################################################## import numpy
 import gym import math import random import numpy as np import matplotlib import matplotlib.pyplot as plt from collections import namedtuple from itertools import count from copy import deepcopy from PIL import Image import torch import torch.nn as nn import torch.optim as optim import torch.nn.functional as F from torch.autograd import Variable import torchvision.transforms as T env = gym. make('CartPole-v0').unwrapped is_python = 'inline' in matplotlib.get_backend() if is_python: from IPython import display plt.ion()
 # -*- coding: utf-8 -*- """ Translation with a Sequence to Sequence Network and Attention ************************************************************* **Author**: `Sean Robertson `_ In this project we will be teaching a neural network to translate from French to English. :: [KEY: > input, = target, < output] > il est en train de peindre un tableau . = he is painting a picture . < he is painting a picture . > pourquoi ne pas essayer ce vin delicieux ? = why not try that delicious wine ? < why not try that delicious wine ? > elle n est pas poete mais romanciere . = she is not a poet but a novelist . < she not not a poet but a novelist . > vous etes trop maigre . = you re too skinny . < you re all alone . ... to varying degrees of success. This is made possible by the simple but powerful idea of the `sequence to sequence network `__, in which two recurrent neural networks work together to transform one sequence to another. An encoder network condenses an input sequence into a vector, and a decoder network unfolds that vector into a new sequence. .. figure:: /_static/img/seq-seq-images/seq2seq.png :alt: To improve upon this model we'll use an `attention mechanism `__, which lets the decoder learn to focus over a specific range of the input sequence. **Recommended Reading:** I assume you have at least installed PyTorch, know Python, and understand Tensors: - http://pytorch.org/ For installation instructions - :doc:`/beginner/deep_learning_60min_blitz` to get started with PyTorch in general - :doc:`/beginner/pytorch_with_examples` for a wide and deep overview - :doc:`/beginner/former_torchies_tutorial` if you are former Lua Torch user It would also be useful to know about Sequence to Sequence networks and how they work: - `Learning Phrase Representations using RNN Encoder-Decoder for Statistical Machine Translation `__ - `Sequence to Sequence Learning with Neural Networks `__ - `Neural Machine Translation by Jointly Learning to Align and Translate `__ - `A Neural Conversational Model `__ You will also find the previous tutorials on :doc:`/intermediate/char_rnn_classification_tutorial` and :doc:`/intermediate/char_rnn_generation_tutorial` helpful as those concepts are very similar to the Encoder and Decoder models, respectively. And for more, read the papers that introduced these topics: - `Learning Phrase Representations using RNN Encoder-Decoder for Statistical Machine Translation `__ - `Sequence to Sequence Learning with Neural Networks `__ - `Neural Machine Translation by Jointly Learning to Align and Translate `__ - `A Neural Conversational Model `__ **Requirements** """ from __future__ import unicode_literals, print_function, division from io import open import unicodedata import string import re import random import torch import torch.nn as nn from torch.autograd import Variable from torch import optim import torch.nn.functional as F use_cuda = torch.cuda.is_available() ###################################################################### # Loading data files # ================== # # The data for this project is a set of many thousands of English to # French translation pairs. # # `This question on Open Data Stack # Exchange `__ # pointed me to the open translation site http://tatoeba.org/ which has # downloads available at http://tatoeba.org/eng/downloads - and better # yet, someone did the extra work of splitting language pairs into # individual text files here: http://www.manythings.org/anki/ # # The English to French pairs are too big to include in the repo, so # download to ``data/eng-fra.txt`` before continuing. The file is a tab # separated list of translation pairs: # # :: # # I am cold. Je suis froid. # # .. Note:: # Download the data from # `here `_ # and extract it to the current directory. ###################################################################### # Similar to the character encoding used in the character-level RNN # tutorials, we will be representing each word in a language as a one-hot # vector, or giant vector of zeros except for a single one (at the index # of the word). Compared to the dozens of characters that might exist in a # language, there are many many more words, so the encoding vector is much # larger. We will however cheat a bit and trim the data to only use a few # thousand words per language. # # .. figure:: /_static/img/seq-seq-images/word-encoding.png # :alt: # # ###################################################################### # We'll need a unique index per word to use as the inputs and targets of # the networks later. To keep track of all this we will use a helper class # called ``Lang`` which has word → index (``word2index``) and index → word # (``index2word``) dictionaries, as well as a count of each word # ``word2count`` to use to later replace rare words. # SOS_token = 0 EOS_token = 1 class Lang: def __init__(self, name): self.name = name self.word2index = {} self.word2count = {} self.index2word = {0: "SOS", 1: "EOS"} self.n_words = 2 # Count SOS and EOS def addSentence(self, sentence): for word in sentence.split(' '): self.addWord(word) def addWord(self, word): if word not in self.word2index: self.word2index[word] = self.n_words self.word2count[word] = 1 self.index2word[self.n_words] = word self.n_words += 1 else: self.word2count[word] += 1 ###################################################################### # The files are all in Unicode, to simplify we will turn Unicode # characters to ASCII, make everything lowercase, and trim most # punctuation. # # Turn a Unicode string to plain ASCII, thanks to # http://stackoverflow.com/a/518232/2809427 def unicodeToAscii(s): return ''.join( c for c in unicodedata.normalize('NFD', s) if unicodedata.category(c) != 'Mn' ) # Lowercase, trim, and remove non-letter characters def normalizeString(s): s = unicodeToAscii(s.lower().strip()) s = re.sub(r"([.!?])", r" \1", s) s = re.sub(r"[^a-zA-Z.!?]+", r" ", s) return s ###################################################################### # To read the data file we will split the file into lines, and then split # lines into pairs. The files are all English → Other Language, so if we # want to translate from Other Language → English I added the ``reverse`` # flag to reverse the pairs. # def readLangs(lang1, lang2, reverse=False): print("Reading lines...") # Read the file and split into lines lines = open('data/%s-%s.txt' % (lang1, lang2), encoding='utf-8').\ read().strip().split('\n') # Split every line into pairs and normalize pairs = [[normalizeString(s) for s in l.split('\t')] for l in lines] # Reverse pairs, make Lang instances if reverse: pairs = [list(reversed(p)) for p in pairs] input_lang = Lang(lang2) output_lang = Lang(lang1) else: input_lang = Lang(lang1) output_lang = Lang(lang2) return input_lang, output_lang, pairs ###################################################################### # Since there are a *lot* of example sentences and we want to train # something quickly, we'll trim the data set to only relatively short and # simple sentences. Here the maximum length is 10 words (that includes # ending punctuation) and we're filtering to sentences that translate to # the form "I am" or "He is" etc. (accounting for apostrophes replaced # earlier). # MAX_LENGTH = 10 eng_prefixes = ( "i am ", "i m ", "he is", "he s ", "she is", "she s", "you are", "you re ", "we are", "we re ", "they are", "they re " ) def filterPair(p): return len(p.split(' ')) < MAX_LENGTH and \ len(p.split(' ')) < MAX_LENGTH and \ p.startswith(eng_prefixes) def filterPairs(pairs): return [pair for pair in pairs if filterPair(pair)] ###################################################################### # The full process for preparing the data is: # # - Read text file and split into lines, split lines into pairs # - Normalize text, filter by length and content # - Make word lists from sentences in pairs # def prepareData(lang1, lang2, reverse=False): input_lang, output_lang, pairs = readLangs(lang1, lang2, reverse) print("Read %s sentence pairs" % len(pairs)) pairs = filterPairs(pairs) print("Trimmed to %s sentence pairs" % len(pairs)) print("Counting words...") for pair in pairs: input_lang.addSentence(pair) output_lang.addSentence(pair) print("Counted words:") print(input_lang.name, input_lang.n_words) print(output_lang.name, output_lang.n_words) return input_lang, output_lang, pairs input_lang, output_lang, pairs = prepareData('eng', 'fra', True) print(random.choice(pairs)) ###################################################################### # The Seq2Seq Model # ================= # # A Recurrent Neural Network, or RNN, is a network that operates on a # sequence and uses its own output as input for subsequent steps. # # A `Sequence to Sequence network `__, or # seq2seq network, or `Encoder Decoder # network `__, is a model # consisting of two RNNs called the encoder and decoder. The encoder reads # an input sequence and outputs a single vector, and the decoder reads # that vector to produce an output sequence. # # .. figure:: /_static/img/seq-seq-images/seq2seq.png # :alt: # # Unlike sequence prediction with a single RNN, where every input # corresponds to an output, the seq2seq model frees us from sequence # length and order, which makes it ideal for translation between two # languages. # # Consider the sentence "Je ne suis pas le chat noir" → "I am not the # black cat". Most of the words in the input sentence have a direct # translation in the output sentence, but are in slightly different # orders, e.g. "chat noir" and "black cat". Because of the "ne/pas" # construction there is also one more word in the input sentence. It would # be difficult to produce a correct translation directly from the sequence # of input words. # # With a seq2seq model the encoder creates a single vector which, in the # ideal case, encodes the "meaning" of the input sequence into a single # vector — a single point in some N dimensional space of sentences. # ###################################################################### # The Encoder # ----------- # # The encoder of a seq2seq network is a RNN that outputs some value for # every word from the input sentence. For every input word the encoder # outputs a vector and a hidden state, and uses the hidden state for the # next input word. # # .. figure:: /_static/img/seq-seq-images/encoder-network.png # :alt: # # class EncoderRNN(nn.Module): def __init__(self, input_size, hidden_size, n_layers=1): super(EncoderRNN, self).__init__() self.n_layers = n_layers self.hidden_size = hidden_size self.embedding = nn.Embedding(input_size, hidden_size) self.gru = nn.GRU(hidden_size, hidden_size) def forward(self, input, hidden): embedded = self.embedding(input).view(1, 1, -1) output = embedded for i in range(self.n_layers): output, hidden = self.gru(output, hidden) return output, hidden def initHidden(self): result = Variable(torch.zeros(1, 1, self.hidden_size)) if use_cuda: return result.cuda() else: return result ###################################################################### # The Decoder # ----------- # # The decoder is another RNN that takes the encoder output vector(s) and # outputs a sequence of words to create the translation. # ###################################################################### # Simple Decoder # ^^^^^^^^^^^^^^ # # In the simplest seq2seq decoder we use only last output of the encoder. # This last output is sometimes called the *context vector* as it encodes # context from the entire sequence. This context vector is used as the # initial hidden state of the decoder. # # At every step of decoding, the decoder is given an input token and # hidden state. The initial input token is the start-of-string ```` # token, and the first hidden state is the context vector (the encoder's # last hidden state). # # .. figure:: /_static/img/seq-seq-images/decoder-network.png # :alt: # # class DecoderRNN(nn.Module): def __init__(self, hidden_size, output_size, n_layers=1): super(DecoderRNN, self).__init__() self.n_layers = n_layers self.hidden_size = hidden_size self.embedding = nn.Embedding(output_size, hidden_size) self.gru = nn.GRU(hidden_size, hidden_size) self.out = nn.Linear(hidden_size, output_size) self.softmax = nn.LogSoftmax() def forward(self, input, hidden): output = self.embedding(input).view(1, 1, -1) for i in range(self.n_layers): output = F.relu(output) output, hidden = self.gru(output, hidden) output = self.softmax(self.out(output)) return output, hidden def initHidden(self): result = Variable(torch.zeros(1, 1, self.hidden_size)) if use_cuda: return result.cuda() else: return result ###################################################################### # I encourage you to train and observe the results of this model, but to # save space we'll be going straight for the gold and introducing the # Attention Mechanism. # ###################################################################### # Attention Decoder # ^^^^^^^^^^^^^^^^^ # # If only the context vector is passed betweeen the encoder and decoder, # that single vector carries the burden of encoding the entire sentence. # # Attention allows the decoder network to "focus" on a different part of # the encoder's outputs for every step of the decoder's own outputs. First # we calculate a set of *attention weights*. These will be multiplied by # the encoder output vectors to create a weighted combination. The result # (called ``attn_applied`` in the code) should contain information about # that specific part of the input sequence, and thus help the decoder # choose the right output words. # # .. figure:: https://i.imgur.com/1152PYf.png # :alt: # # Calculating the attention weights is done with another feed-forward # layer ``attn``, using the decoder's input and hidden state as inputs. # Because there are sentences of all sizes in the training data, to # actually create and train this layer we have to choose a maximum # sentence length (input length, for encoder outputs) that it can apply # to. Sentences of the maximum length will use all the attention weights, # while shorter sentences will only use the first few. # # .. figure:: /_static/img/seq-seq-images/attention-decoder-network.png # :alt: # # class AttnDecoderRNN(nn.Module): def __init__(self, hidden_size, output_size, n_layers=1, dropout_p=0.1, max_length=MAX_LENGTH): super(AttnDecoderRNN, self).__init__() self.hidden_size = hidden_size self.output_size = output_size self.n_layers = n_layers self.dropout_p = dropout_p self.max_length = max_length self.embedding = nn.Embedding(self.output_size, self.hidden_size) self.attn = nn.Linear(self.hidden_size * 2, self.max_length) self.attn_combine = nn.Linear(self.hidden_size * 2, self.hidden_size) self.dropout = nn.Dropout(self.dropout_p) self.gru = nn.GRU(self.hidden_size, self.hidden_size) self.out = nn.Linear(self.hidden_size, self.output_size) def forward(self, input, hidden, encoder_output, encoder_outputs): embedded = self.embedding(input).view(1, 1, -1) embedded = self.dropout(embedded) attn_weights = F.softmax( self.attn(torch.cat((embedded, hidden), 1))) attn_applied = torch.bmm(attn_weights.unsqueeze(0), encoder_outputs.unsqueeze(0)) output = torch.cat((embedded, attn_applied), 1) output = self.attn_combine(output).unsqueeze(0) for i in range(self.n_layers): output = F.relu(output) output, hidden = self.gru(output, hidden) output = F.log_softmax(self.out(output)) return output, hidden, attn_weights def initHidden(self): result = Variable(torch.zeros(1, 1, self.hidden_size)) if use_cuda: return result.cuda() else: return result ###################################################################### # .. note:: There are other forms of attention that work around the length # limitation by using a relative position approach. Read about "local # attention" in `Effective Approaches to Attention-based Neural Machine # Translation `__. # # Training # ======== # # Preparing Training Data # ----------------------- # # To train, for each pair we will need an input tensor (indexes of the # words in the input sentence) and target tensor (indexes of the words in # the target sentence). While creating these vectors we will append the # EOS token to both sequences. # def indexesFromSentence(lang, sentence): return [lang.word2index[word] for word in sentence.split(' ')] def variableFromSentence(lang, sentence): indexes = indexesFromSentence(lang, sentence) indexes.append(EOS_token) result = Variable(torch.LongTensor(indexes).view(-1, 1)) if use_cuda: return result.cuda() else: return result def variablesFromPair(pair): input_variable = variableFromSentence(input_lang, pair) target_variable = variableFromSentence(output_lang, pair) return (input_variable, target_variable) ###################################################################### # Training the Model # ------------------ # # To train we run the input sentence through the encoder, and keep track # of every output and the latest hidden state. Then the decoder is given # the ```` token as its first input, and the last hidden state of the # encoder as its first hidden state. # # "Teacher forcing" is the concept of using the real target outputs as # each next input, instead of using the decoder's guess as the next input. # Using teacher forcing causes it to converge faster but `when the trained # network is exploited, it may exhibit # instability `__. # # You can observe outputs of teacher-forced networks that read with # coherent grammar but wander far from the correct translation - # intuitively it has learned to represent the output grammar and can "pick # up" the meaning once the teacher tells it the first few words, but it # has not properly learned how to create the sentence from the translation # in the first place. # # Because of the freedom PyTorch's autograd gives us, we can randomly # choose to use teacher forcing or not with a simple if statement. Turn # ``teacher_forcing_ratio`` up to use more of it. # teacher_forcing_ratio = 0.5 def train(input_variable, target_variable, encoder, decoder, encoder_optimizer, decoder_optimizer, criterion, max_length=MAX_LENGTH): encoder_hidden = encoder.initHidden() encoder_optimizer.zero_grad() decoder_optimizer.zero_grad() input_length = input_variable.size() target_length = target_variable.size() encoder_outputs = Variable(torch.zeros(max_length, encoder.hidden_size)) encoder_outputs = encoder_outputs.cuda() if use_cuda else encoder_outputs loss = 0 for ei in range(input_length): encoder_output, encoder_hidden = encoder( input_variable[ei], encoder_hidden) encoder_outputs[ei] = encoder_output decoder_input = Variable(torch.LongTensor([[SOS_token]])) decoder_input = decoder_input.cuda() if use_cuda else decoder_input decoder_hidden = encoder_hidden use_teacher_forcing = True if random.random() < teacher_forcing_ratio else False if use_teacher_forcing: # Teacher forcing: Feed the target as the next input for di in range(target_length): decoder_output, decoder_hidden, decoder_attention = decoder( decoder_input, decoder_hidden, encoder_output, encoder_outputs) loss += criterion(decoder_output, target_variable[di]) decoder_input = target_variable[di] # Teacher forcing else: # Without teacher forcing: use its own predictions as the next input for di in range(target_length): decoder_output, decoder_hidden, decoder_attention = decoder( decoder_input, decoder_hidden, encoder_output, encoder_outputs) topv, topi = decoder_output.data.topk(1) ni = topi decoder_input = Variable(torch.LongTensor([[ni]])) decoder_input = decoder_input.cuda() if use_cuda else decoder_input loss += criterion(decoder_output, target_variable[di]) if ni == EOS_token: break loss.backward() encoder_optimizer.step() decoder_optimizer.step() return loss.data / target_length ###################################################################### # This is a helper function to print time elapsed and estimated time # remaining given the current time and progress %. # import time import math def asMinutes(s): m = math.floor(s / 60) s -= m * 60 return '%dm %ds' % (m, s) def timeSince(since, percent): now = time.time() s = now - since es = s / (percent) rs = es - s return '%s (- %s)' % (asMinutes(s), asMinutes(rs)) ###################################################################### # The whole training process looks like this: # # - Start a timer # - Initialize optimizers and criterion # - Create set of training pairs # - Start empty losses array for plotting # # Then we call ``train`` many times and occasionally print the progress (% # of examples, time so far, estimated time) and average loss. # def trainIters(encoder, decoder, n_iters, print_every=1000, plot_every=100, learning_rate=0.01): start = time.time() plot_losses = [] print_loss_total = 0 # Reset every print_every plot_loss_total = 0 # Reset every plot_every encoder_optimizer = optim.SGD(encoder.parameters(), lr=learning_rate) decoder_optimizer = optim.SGD(decoder.parameters(), lr=learning_rate) training_pairs = [variablesFromPair(random.choice(pairs)) for i in range(n_iters)] criterion = nn.NLLLoss() for iter in range(1, n_iters + 1): training_pair = training_pairs[iter - 1] input_variable = training_pair target_variable = training_pair loss = train(input_variable, target_variable, encoder, decoder, encoder_optimizer, decoder_optimizer, criterion) print_loss_total += loss plot_loss_total += loss if iter % print_every == 0: print_loss_avg = print_loss_total / print_every print_loss_total = 0 print('%s (%d %d%%) %.4f' % (timeSince(start, iter / n_iters), iter, iter / n_iters * 100, print_loss_avg)) if iter % plot_every == 0: plot_loss_avg = plot_loss_total / plot_every plot_losses.append(plot_loss_avg) plot_loss_total = 0 showPlot(plot_losses) ###################################################################### # Plotting results # ---------------- # # Plotting is done with matplotlib, using the array of loss values # ``plot_losses`` saved while training. # import matplotlib.pyplot as plt import matplotlib.ticker as ticker import numpy as np def showPlot(points): plt.figure() fig, ax = plt.subplots() # this locator puts ticks at regular intervals loc = ticker.MultipleLocator(base=0.2) ax.yaxis.set_major_locator(loc) plt.plot(points) ###################################################################### # Evaluation # ========== # # Evaluation is mostly the same as training, but there are no targets so # we simply feed the decoder's predictions back to itself for each step. # Every time it predicts a word we add it to the output string, and if it # predicts the EOS token we stop there. We also store the decoder's # attention outputs for display later. # def evaluate(encoder, decoder, sentence, max_length=MAX_LENGTH): input_variable = variableFromSentence(input_lang, sentence) input_length = input_variable.size() encoder_hidden = encoder.initHidden() encoder_outputs = Variable(torch.zeros(max_length, encoder.hidden_size)) encoder_outputs = encoder_outputs.cuda() if use_cuda else encoder_outputs for ei in range(input_length): encoder_output, encoder_hidden = encoder(input_variable[ei], encoder_hidden) encoder_outputs[ei] = encoder_outputs[ei] + encoder_output decoder_input = Variable(torch.LongTensor([[SOS_token]])) # SOS decoder_input = decoder_input.cuda() if use_cuda else decoder_input decoder_hidden = encoder_hidden decoded_words = [] decoder_attentions = torch.zeros(max_length, max_length) for di in range(max_length): decoder_output, decoder_hidden, decoder_attention = decoder( decoder_input, decoder_hidden, encoder_output, encoder_outputs) decoder_attentions[di] = decoder_attention.data topv, topi = decoder_output.data.topk(1) ni = topi if ni == EOS_token: decoded_words.append('') break else: decoded_words.append(output_lang.index2word[ni]) decoder_input = Variable(torch.LongTensor([[ni]])) decoder_input = decoder_input.cuda() if use_cuda else decoder_input return decoded_words, decoder_attentions[:di + 1] ###################################################################### # We can evaluate random sentences from the training set and print out the # input, target, and output to make some subjective quality judgements: # def evaluateRandomly(encoder, decoder, n=10): for i in range(n): pair = random.choice(pairs) print('>', pair) print('=', pair) output_words, attentions = evaluate(encoder, decoder, pair) output_sentence = ' '.join(output_words) print('<', output_sentence) print('') ###################################################################### # Training and Evaluating # ======================= # # With all these helper functions in place (it looks like extra work, but # it's easier to run multiple experiments easier) we can actually # initialize a network and start training. # # Remember that the input sentences were heavily filtered. For this small # dataset we can use relatively small networks of 256 hidden nodes and a # single GRU layer. After about 40 minutes on a MacBook CPU we'll get some # reasonable results. # # .. Note:: # If you run this notebook you can train, interrupt the kernel, # evaluate, and continue training later. Comment out the lines where the # encoder and decoder are initialized and run ``trainIters`` again. # hidden_size = 256 encoder1 = EncoderRNN(input_lang.n_words, hidden_size) attn_decoder1 = AttnDecoderRNN(hidden_size, output_lang.n_words, 1, dropout_p=0.1) if use_cuda: encoder1 = encoder1.cuda() attn_decoder1 = attn_decoder1.cuda() trainIters(encoder1, attn_decoder1, 75000, print_every=5000) ###################################################################### # evaluateRandomly(encoder1, attn_decoder1) ###################################################################### # Visualizing Attention # --------------------- # # A useful property of the attention mechanism is its highly interpretable # outputs. Because it is used to weight specific encoder outputs of the # input sequence, we can imagine looking where the network is focused most # at each time step. # # You could simply run ``plt.matshow(attentions)`` to see attention output # displayed as a matrix, with the columns being input steps and rows being # output steps: # output_words, attentions = evaluate( encoder1, attn_decoder1, "je suis trop froid .") plt.matshow(attentions.numpy()) ###################################################################### # For a better viewing experience we will do the extra work of adding axes # and labels: # def showAttention(input_sentence, output_words, attentions): # Set up figure with colorbar fig = plt.figure() ax = fig.add_subplot(111) cax = ax.matshow(attentions.numpy(), cmap='bone') fig.colorbar(cax) # Set up axes ax.set_xticklabels([''] + input_sentence.split(' ') + [''], rotation=90) ax.set_yticklabels([''] + output_words) # Show label at every tick ax.xaxis.set_major_locator(ticker.MultipleLocator(1)) ax.yaxis.set_major_locator(ticker.MultipleLocator(1)) plt.show() def evaluateAndShowAttention(input_sentence): output_words, attentions = evaluate( encoder1, attn_decoder1, input_sentence) print('input =', input_sentence) print('output =', ' '.join(output_words)) showAttention(input_sentence, output_words, attentions) evaluateAndShowAttention("elle a cinq ans de moins que moi .") evaluateAndShowAttention("elle est trop petit .") evaluateAndShowAttention("je ne crains pas de mourir .") evaluateAndShowAttention("c est un jeune directeur plein de talent .") ###################################################################### # Exercises # ========= # # - Try with a different dataset # # - Another language pair # - Human → Machine (e.g. IOT commands) # - Chat → Response # - Question → Answer # # - Replace the embeddings with pre-trained word embeddings such as word2vec or # GloVe # - Try with more layers, more hidden units, and more sentences. Compare # the training time and results. # - If you use a translation file where pairs have two of the same phrase # (``I am test \t I am test``), you can use this as an autoencoder. Try # this: # # - Train as an autoencoder # - Save only the Encoder network # - Train a new Decoder for translation from there #
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