implemented method to compute WCE only for well represented classes;

refactored MLE class in order to support WCE, standard embeddings and combinations;
sketched out NN implementation for WE compositionality;
still TODO SIF embeddings;

src/FPEC_andrea.py

@@ -6,7 +6,7 @@ from optparse import OptionParser
 from util.file import exists
 from util.results import PolylingualClassificationResults
 from sklearn.svm import SVC
-
+from util.util import get_learner, get_params
 
 parser = OptionParser()
 
@@ -115,7 +115,7 @@ if __name__ == '__main__':
         config = {'unsupervised': True,
                   'supervised': True,
                   'we_type': op.we_type}
-        _config_id = 'M_and_F'
+        _config_id = 'M+F'
 
     config['reduction'] = 'PCA'
     config['max_label_space'] = op.max_labels_S
@@ -125,32 +125,6 @@ if __name__ == '__main__':
 
     result_id = dataset_file + 'PolyEmbedd_andrea_' + _config_id + ('_optimC' if op.optimc else '')
 
-    PLE_test = True
-    if PLE_test:
-        ple = PolylingualEmbeddingsClassifier(wordembeddings_path='/home/andreapdr/CLESA/',
-                                              config = config,
-                                              learner=get_learner(calibrate=False),
-                                              c_parameters=get_params(dense=False),
-                                              n_jobs=op.n_jobs)
-
-        print('# Fitting ...')
-        ple.fit(lXtr, lytr)
-
-        print('# Evaluating ...')
-        ple_eval = evaluate_method(ple, lXte, lyte)
-
-        metrics = []
-        for lang in lXte.keys():
-            macrof1, microf1, macrok, microk = ple_eval[lang]
-            metrics.append([macrof1, microf1, macrok, microk])
-            print('Lang %s: macro-F1=%.3f micro-F1=%.3f' % (lang, macrof1, microf1))
-            results.add_row('MLE', 'svm', 'no', config['we_type'],
-                            'no','no', op.optimc, op.dataset.split('/')[-1], ple.time,
-                            lang, macrof1, microf1, macrok, microk, '')
-        print('Averages: MF1, mF1, MK, mK', np.mean(np.array(metrics), axis=0))
-        exit()
-
-
     print(f'### PolyEmbedd_andrea_{_config_id}\n')
     classifier = AndreaCLF(we_path=op.we_path,
                            config=config,
@@ -174,5 +148,5 @@ if __name__ == '__main__':
         results.add_row('PolyEmbed_andrea', 'svm', _config_id, config['we_type'],
                         (config['max_label_space'], classifier.best_components),
                         config['dim_reduction_unsupervised'], op.optimc, op.dataset.split('/')[-1], classifier.time,
-                        lang, macrof1, microf1, macrok, microk, 'min_prevalence = 0')
+                        lang, macrof1, microf1, macrok, microk, '')
     print('Averages: MF1, mF1, MK, mK', np.mean(np.array(metrics), axis=0))

src/MLE_andrea.py

@@ -0,0 +1,128 @@
+import os
+from dataset_builder import MultilingualDataset
+from learning.learners import *
+from util.evaluation import *
+from optparse import OptionParser
+from util.file import exists
+from util.results import PolylingualClassificationResults
+from util.util import get_learner, get_params
+
+parser = OptionParser()
+
+parser.add_option("-d", "--dataset", dest="dataset",
+                  help="Path to the multilingual dataset processed and stored in .pickle format",
+                  default="/home/moreo/CLESA/rcv2/rcv1-2_doclist_trByLang1000_teByLang1000_processed_run0.pickle")
+
+parser.add_option("-o", "--output", dest="output",
+                  help="Result file", type=str,  default='./results/results.csv')
+
+parser.add_option("-e", "--mode-embed", dest="mode_embed",
+                  help="Set the embedding to be used [none, unsupervised, supervised, both]", type=str, default='none')
+
+parser.add_option("-w", "--we-path", dest="we_path",
+                  help="Path to the polylingual word embeddings", default='/home/andreapdr/CLESA/')
+
+parser.add_option('-t', "--we-type", dest="we_type", help="Aligned embeddings to use [FastText, MUSE]", type=str,
+                  default='MUSE')
+
+parser.add_option("-s", "--set_c", dest="set_c",type=float,
+                  help="Set the C parameter", default=1)
+
+parser.add_option("-c", "--optimc", dest="optimc", action='store_true',
+                  help="Optimize hyperparameters", default=False)
+
+parser.add_option("-j", "--n_jobs", dest="n_jobs",type=int,
+                  help="Number of parallel jobs (default is -1, all)", default=-1)
+
+parser.add_option("-p", "--pca", dest="max_labels_S", type=int,
+                  help="If smaller than number of target classes, PCA will be applied to supervised matrix. "
+                       "If set to 0 it will automatically search for the best number of components. "
+                       "If set to -1 it will apply PCA to the vstacked supervised matrix (PCA dim set to 50 atm)",
+                  default=300)
+
+parser.add_option("-u", "--upca", dest="max_labels_U", type=int,
+                  help="If smaller than Unsupervised Dimension, PCA will be applied to unsupervised matrix."
+                       " If set to 0 it will automatically search for the best number of components", default=300)
+
+parser.add_option("-l", dest="lang", type=str)
+
+if __name__ == '__main__':
+    (op, args) = parser.parse_args()
+
+    assert exists(op.dataset), 'Unable to find file '+str(op.dataset)
+    assert not (op.set_c != 1. and op.optimc), 'Parameter C cannot be defined along with optim_c option'
+
+    dataset_file = os.path.basename(op.dataset)
+
+    results = PolylingualClassificationResults('./results/PLE_results.csv')
+
+    data = MultilingualDataset.load(op.dataset)
+    data.show_dimensions()
+
+    # data.set_view(languages=['en','it', 'pt', 'sv'], categories=list(range(10)))
+    # data.set_view(languages=[op.lang])
+    # data.set_view(categories=list(range(10)))
+    lXtr, lytr = data.training()
+    lXte, lyte = data.test()
+
+    if op.set_c != -1:
+        meta_parameters = None
+    else:
+        meta_parameters = [{'C': [1e3, 1e2, 1e1, 1, 1e-1]}]
+
+    # Embeddings and WCE config
+    _available_mode = ['none', 'unsupervised', 'supervised', 'both']
+    _available_type = ['MUSE', 'FastText']
+    assert op.mode_embed in _available_mode, f'{op.mode_embed} not in {_available_mode}'
+    assert op.we_type in _available_type, f'{op.we_type} not in {_available_type}'
+
+    if op.mode_embed == 'none':
+        config = {'unsupervised': False,
+                  'supervised': False,
+                  'we_type': None}
+        _config_id = 'None'
+    elif op.mode_embed == 'unsupervised':
+        config = {'unsupervised': True,
+                  'supervised': False,
+                  'we_type': op.we_type}
+        _config_id = 'M'
+    elif op.mode_embed == 'supervised':
+        config = {'unsupervised': False,
+                  'supervised': True,
+                  'we_type': None}
+        _config_id = 'F'
+    elif op.mode_embed == 'both':
+        config = {'unsupervised': True,
+                  'supervised': True,
+                  'we_type': op.we_type}
+        _config_id = 'M+F'
+
+    config['reduction'] = 'PCA'
+    config['max_label_space'] = op.max_labels_S
+    config['dim_reduction_unsupervised'] = op.max_labels_U
+    # config['post_pca'] = op.post_pca
+    # config['plot_covariance_matrices'] = True
+
+    result_id = dataset_file + 'MLE_andrea' + _config_id + ('_optimC' if op.optimc else '')
+
+    ple = PolylingualEmbeddingsClassifier(wordembeddings_path='/home/andreapdr/CLESA/',
+                                          config = config,
+                                          learner=get_learner(calibrate=False),
+                                          c_parameters=get_params(dense=False),
+                                          n_jobs=op.n_jobs)
+
+    print('# Fitting ...')
+    ple.fit(lXtr, lytr)
+
+    print('# Evaluating ...')
+    ple_eval = evaluate_method(ple, lXte, lyte)
+
+    metrics = []
+    for lang in lXte.keys():
+        macrof1, microf1, macrok, microk = ple_eval[lang]
+        metrics.append([macrof1, microf1, macrok, microk])
+        print('Lang %s: macro-F1=%.3f micro-F1=%.3f' % (lang, macrof1, microf1))
+        results.add_row('MLE', 'svm', _config_id, config['we_type'],
+                        'no','no', op.optimc, op.dataset.split('/')[-1], ple.time,
+                        lang, macrof1, microf1, macrok, microk, '')
+    print('Averages: MF1, mF1, MK, mK', np.mean(np.array(metrics), axis=0))

src/NN_FPEC_andrea.py

@@ -0,0 +1,92 @@
+from optparse import OptionParser
+from util.results import PolylingualClassificationResults
+from dataset_builder import MultilingualDataset
+from keras.preprocessing.text import Tokenizer
+from learning.learners import MonolingualNetSvm
+from sklearn.svm import SVC
+import pickle
+
+parser = OptionParser()
+
+parser.add_option("-d", "--dataset", dest="dataset",
+                  help="Path to the multilingual dataset processed and stored in .pickle format",
+                  default="/home/moreo/CLESA/rcv2/rcv1-2_doclist_trByLang1000_teByLang1000_processed_run0.pickle")
+
+parser.add_option("-c", "--optimc", dest="optimc", action='store_true',
+                  help="Optimize hyperparameters", default=False)
+
+parser.add_option("-s", "--set_c", dest="set_c",type=float,
+                  help="Set the C parameter", default=1)
+
+(op, args) = parser.parse_args()
+
+
+###################################################################################################################
+
+def get_learner(calibrate=False, kernel='linear'):
+    return SVC(kernel=kernel, probability=calibrate, cache_size=1000, C=op.set_c, random_state=1, class_weight='balanced', gamma='auto')
+
+
+def get_params(dense=False):
+    if not op.optimc:
+        return None
+    c_range = [1e4, 1e3, 1e2, 1e1, 1, 1e-1]
+    kernel = 'rbf' if dense else 'linear'
+    return [{'kernel': [kernel], 'C': c_range, 'gamma':['auto']}]
+
+
+# PREPROCESS TEXT AND SAVE IT ... both for SVM and NN
+def preprocess_data(lXtr, lXte, lytr, lyte):
+    tokenized_tr = dict()
+    tokenized_te = dict()
+    for lang in lXtr.keys():
+        alltexts = ' '.join(lXtr[lang])
+        tokenizer = Tokenizer()
+        tokenizer.fit_on_texts(alltexts.split(' '))
+        tokenizer.oov_token = len(tokenizer.word_index)+1
+        # dumping train set
+        sequences_tr = tokenizer.texts_to_sequences(lXtr[lang])
+        tokenized_tr[lang] = (tokenizer.word_index, sequences_tr, lytr[lang])
+        # dumping test set
+        sequences_te = tokenizer.texts_to_sequences(lXte[lang])
+        tokenized_te[lang] = (tokenizer.word_index, sequences_te, lyte[lang])
+
+    with open('/home/andreapdr/CLESA/preprocessed_dataset_nn/rcv1-2_train.pickle', 'wb') as f:
+        pickle.dump(tokenized_tr, f)
+
+    with open('/home/andreapdr/CLESA/preprocessed_dataset_nn/rcv1-2_test.pickle', 'wb') as f:
+        pickle.dump(tokenized_tr, f)
+
+    print('Successfully dumped data')
+
+# def load_preprocessed():
+#     with open('/home/andreapdr/CLESA/preprocessed_dataset_nn/rcv1-2_train.pickle', 'rb') as f:
+#         return pickle.load(f)
+#
+# def build_embedding_matrix(lang, word_index):
+#     type = 'MUSE'
+#     path = '/home/andreapdr/CLESA/'
+#     MUSE = EmbeddingsAligned(type, path, lang, word_index.keys())
+#     return MUSE
+
+
+########## MAIN #################################################################################################
+
+if __name__ == '__main__':
+    results = PolylingualClassificationResults('./results/NN_FPEC_results.csv')
+    data = MultilingualDataset.load(op.dataset)
+    lXtr, lytr = data.training()
+    lXte, lyte = data.test()
+
+    if op.set_c != -1:
+        meta_parameters = None
+    else:
+        meta_parameters = [{'C': [1e3, 1e2, 1e1, 1, 1e-1]}]
+
+    test_architecture = MonolingualNetSvm(lXtr,
+                                          lytr,
+                                          first_tier_learner=get_learner(calibrate=True),
+                                          first_tier_parameters=None,
+                                          n_jobs=1)
+
+    test_architecture.fit()

src/learning/embeddings.py

@@ -3,8 +3,9 @@ import pickle
 from torchtext.vocab import Vectors
 import torch
 from abc import ABC, abstractmethod
-from data.supervised import get_supervised_embeddings
+from learning.supervised import get_supervised_embeddings
 from util.decompositions import *
+from util.SIF_embed import *
 
 
 class PretrainedEmbeddings(ABC):
@@ -233,7 +234,6 @@ class StorageEmbeddings:
             print(f'# REDUCING LABELS TO min_prevalence = {min_prevalence} in order to compute WCE Matrix ...')
             langs = list(docs.keys())
             well_repr_cats = np.logical_and.reduce([labels[lang].sum(axis=0)>min_prevalence for lang in langs])
-            # lY = {lY[lang][:, well_repr_cats] for lang in langs}  TODO not clear
             for lang in langs:
                 labels[lang] = labels[lang][:, well_repr_cats]
             print(f'Target number reduced to: {labels[lang].shape[1]}\n')
@@ -245,15 +245,15 @@ class StorageEmbeddings:
             nC = self.lang_S[lang].shape[1]
             print(f'[embedding matrix done] of shape={self.lang_S[lang].shape}\n')
 
-        if max_label_space == 0:
+        if max_label_space == 0:    # looking for best n_components analyzing explained_variance_ratio
             print(f'Computing optimal number of PCA components along matrices S')
             optimal_n = get_optimal_dim(self.lang_S, 'S')
             print(f'Applying PCA(n_components={optimal_n})')
             self.lang_S = run_pca(optimal_n, self.lang_S)
-        elif max_label_space == -1:
+        elif max_label_space == -1: # applying pca to the verticals stacked matrix of WCE embeddings
             print(f'Computing PCA on vertical stacked WCE embeddings')
             languages = self.lang_S.keys()
-            _temp_stack = np.vstack([self.lang_S[lang] for lang in languages])
+            _temp_stack = np.vstack([self.lang_S[lang] for lang in languages])  # stacking WCE vertically
             stacked_pca = PCA(n_components=_temp_stack.shape[1])
             stacked_pca.fit(_temp_stack)
             best_n = None
@@ -271,12 +271,15 @@ class StorageEmbeddings:
             print(f'Applying PCA(n_components={i}')
             for lang in languages:
                 self.lang_S[lang] = stacked_pca.transform(self.lang_S[lang])
-        elif max_label_space <= nC: # also equal in order to reduce it to the same initial dimension
+        elif max_label_space <= nC: # less or equal in order to reduce it to the same initial dimension
             print(f'Computing PCA on Supervised Matrix PCA(n_components:{max_label_space})')
             self.lang_S = run_pca(max_label_space, self.lang_S)
 
         return
 
+    def SIF_embeddings(self):
+        print('todo') # TODO
+
     def _concatenate_embeddings(self, docs):
         _r = dict()
         for lang in self.lang_U.keys():
@@ -293,6 +296,9 @@ class StorageEmbeddings:
     def predict(self, config, docs):
         if config['supervised'] and config['unsupervised']:
             return self._concatenate_embeddings(docs)
+            # todo testing applying pca to hstack muse + wce
+            # _reduced = self._concatenate_embeddings(docs)
+            # return run_pca(300, _reduced)
         elif config['supervised']:
             _r = dict()
             for lang in docs.keys():
@@ -301,4 +307,5 @@ class StorageEmbeddings:
             _r = dict()
             for lang in docs.keys():
                 _r[lang] = docs[lang].dot(self.lang_U[lang])
+
         return _r

src/learning/learners.py

@@ -1,6 +1,6 @@
 import numpy as np
 import time
-from data.embeddings import WordEmbeddings, StorageEmbeddings
+from learning.embeddings import WordEmbeddings, StorageEmbeddings
 from scipy.sparse import issparse
 from sklearn.multiclass import OneVsRestClassifier
 from sklearn.model_selection import GridSearchCV
@@ -9,6 +9,7 @@ from joblib import Parallel, delayed
 from sklearn.feature_extraction.text import TfidfVectorizer
 from transformers.StandardizeTransformer import StandardizeTransformer
 from sklearn.decomposition import PCA
+from models.cnn_class import CNN_pdr
 
 
 def _sort_if_sparse(X):
@@ -581,3 +582,151 @@ class PolylingualEmbeddingsClassifier:
 
     def best_params(self):
         return self.model.best_params()
+
+
+class MonolingualNetSvm:
+    """
+    testing: funnelling with NN managing word embeddings compositionality. An ensemble of n-SVMs (n equals to the
+    number of training languages) is first fit on the data, generating the documents projection in the Z-space. Next,
+    the projection are fed to a single NN with their respective document embeddings. The documents are projected into
+    the embedding space while preserving their dimensionality (output dim is 300). These projection are horizonatally
+    concatenated with the respective projection and passed through a fC layer with sigmoid act and output dim equal
+    to the number of target classes.
+    # TODO ATM testing with only 1 language
+    """
+    def __init__(self, lX, ly, first_tier_learner, first_tier_parameters, n_jobs):
+        self.lX = lX
+        self.ly = ly
+        # SVM Attributes
+        self.doc_projector = NaivePolylingualClassifier(first_tier_learner, first_tier_parameters,
+                                                        n_jobs=n_jobs)
+        self.calmode = 'cal'
+        self.languages = []
+        self.lang_word2idx = dict()
+        self.lang_tfidf = {}
+        self.base_learner = 'TODO'
+        self.parameters = 'TODO'
+        # NN Attributes
+        self.NN = 'TODO'
+
+
+    def load_preprocessed(self):
+        """
+        in order to speed up the process, documents are first tokenized in the "main". Here, tokenized docs, word_index, and
+        targets are loaded.
+        :return: dict[lang] = (word_index, tokenized_docs, targets)
+        """
+        import pickle
+        with open('/home/andreapdr/CLESA/preprocessed_dataset_nn/rcv1-2_train.pickle', 'rb') as f:
+            return pickle.load(f)
+
+    def _build_embedding_matrix(self, lang, word_index):
+        """
+        build embedding matrix by filtering out OOV embeddings
+        :param lang:
+        :param word_index:
+        :return: filtered embedding matrix
+        """
+        from learning.embeddings import EmbeddingsAligned
+        type = 'MUSE'
+        path = '/home/andreapdr/CLESA/'
+        MUSE = EmbeddingsAligned(type, path, lang, word_index.keys())
+        return MUSE
+
+    def get_data_and_embed(self, data_dict):
+        from keras.preprocessing.sequence import pad_sequences
+
+        langs = data_dict.keys()
+        lang_embedding_matrix = dict()
+        nn_lXtr = dict()
+        nn_lytr = dict()
+
+        for lang in langs:
+            lang_embedding_matrix[lang] = self._build_embedding_matrix(lang, data_dict[lang][0])
+            nn_lXtr[lang] = pad_sequences(data_dict[lang][1], 100, padding='post')
+            nn_lytr[lang] = [data_dict[lang][2]]
+
+        return  nn_lXtr, nn_lytr, lang_embedding_matrix
+
+    def svm_vectorize(self, lX, prediction=False):
+        langs = list(lX.keys())
+        print(f'# tfidf-vectorizing docs')
+        if prediction:
+            for lang in langs:
+                assert lang in self.lang_tfidf.keys(), 'no tf-idf for given language'
+                tfidf_vectorizer = self.lang_tfidf[lang]
+                lX[lang] = tfidf_vectorizer.transform(lX[lang])
+            return self
+        for lang in langs:
+            tfidf_vectorizer = TfidfVectorizer(sublinear_tf=True, use_idf=True)
+            self.languages.append(lang)
+            tfidf_vectorizer.fit(lX[lang])
+            lX[lang] = tfidf_vectorizer.transform(lX[lang])
+            self.lang_word2idx[lang] = tfidf_vectorizer.vocabulary_
+            self.lang_tfidf[lang] = tfidf_vectorizer
+        return lX
+
+    def _get_zspace(self, lXtr, lYtr):
+        print('\nfitting the projectors... {}'.format(list(lXtr.keys())))
+        self.doc_projector.fit(lXtr, lYtr)
+
+        print('\nprojecting the documents')
+        lZ = self._projection(self.doc_projector, lXtr)
+
+        return lZ, lYtr
+
+    def _projection(self, doc_projector, lX):
+        """
+        Decides the projection function to be applied; predict_proba if the base classifiers are calibrated or
+        decision_function if otherwise
+        :param doc_projector: the document projector (a NaivePolylingualClassifier)
+        :param lX: {lang:matrix} to train
+        :return: the projection, applied with predict_proba or decision_function
+        """
+        if self.calmode=='cal':
+            return doc_projector.predict_proba(lX)
+        else:
+            l_decision_scores = doc_projector.decision_function(lX)
+            if self.calmode=='sigmoid':
+                def sigmoid(x): return 1 / (1 + np.exp(-x))
+                for lang in l_decision_scores.keys():
+                    l_decision_scores[lang] = sigmoid(l_decision_scores[lang])
+            return l_decision_scores
+
+    def fit(self):
+        """
+        # 1. Fit SVM to generate posterior probabilities:
+        #   1.1 Gather documents and vectorize them as in other SVM classifiers
+        # 2. Fit NN
+        #   2.1 Gather documents and build NN dataset by indexing wrt embedding matrix
+        #   2.2 Fit NN first-layer to generate compositional doc embedding
+        #   2.3 H-stack doc-embed and posterior P
+        #   2.4 Feed stacked vector to output layer (sigmoid act): output Nc
+        #   2.5 Train it...
+        """
+
+        # load pre-processed data
+        data_dict = self.load_preprocessed()
+        # build embedding matrices and neural network document training set
+        nn_lXtr, nn_lytr, lang_embedding_matrix = self.get_data_and_embed(data_dict)
+        # TF-IDF vectorzing documents for SVM classifier
+        svm_lX = self.svm_vectorize(self.lX)
+
+        # just testing on a smaller subset of data
+        test_svm_lX = dict()
+        test_svm_ly = dict()
+        test_svm_lX['it'] = svm_lX['it'][:10, :]
+        test_svm_ly['it'] = self.ly['it'][:10, :]
+        test_nn_data = nn_lXtr['it'][:10]
+
+        # projecting document into Z space by SVM
+        svm_Z, _ = self._get_zspace(test_svm_lX, test_svm_ly)
+
+        # initializing net and forward pass
+        net = CNN_pdr(73, 1, 300, len(lang_embedding_matrix['it'].vectors), 300, lang_embedding_matrix['it'].vectors)
+        out = net.forward(test_nn_data, svm_Z['it'])
+
+        print('TODO')
+
+    def net(self):
+        pass

src/models/cnn_class.py

@@ -0,0 +1,42 @@
+import torch.nn as nn
+from torch.nn import functional as F
+import torch
+
+class CNN_pdr(nn.Module):
+
+    def __init__(self, output_size, out_channels, compositional_dim, vocab_size, emb_dim, embeddings=None, drop_embedding_range=None,
+                 drop_embedding_prop=0, drop_prob=0.5):
+        super(CNN_pdr, self).__init__()
+        self.vocab_size = vocab_size
+        self.emb_dim = emb_dim
+        self.embeddings = torch.FloatTensor(embeddings)
+        self.embedding_layer = nn.Embedding(vocab_size, emb_dim, _weight=self.embeddings)
+        self.kernel_heights = kernel_heights=[3,5,7]
+        self.stride = 1
+        self.padding = 0
+        self.drop_embedding_range = drop_embedding_range
+        self.drop_embedding_prop = drop_embedding_prop
+        assert 0 <= drop_embedding_prop <= 1, 'drop_embedding_prop: wrong range'
+        self.nC = 73
+
+        self.conv1 = nn.Conv2d(1, compositional_dim, (self.kernel_heights[0], self.emb_dim), self.stride, self.padding)
+        self.dropout = nn.Dropout(drop_prob)
+        self.label = nn.Linear(len(kernel_heights) * out_channels, output_size)
+        self.fC = nn.Linear(compositional_dim + self.nC, self.nC)
+
+
+    def forward(self, x, svm_output):
+        x = torch.LongTensor(x)
+        svm_output = torch.FloatTensor(svm_output)
+        x = self.embedding_layer(x)
+        x = self.conv1(x.unsqueeze(1))
+        x = F.relu(x.squeeze(3))
+        x = F.max_pool1d(x, x.size()[2]).squeeze(2)
+        x = torch.cat((x, svm_output), 1)
+        x = F.sigmoid(self.fC(x))
+        return x    #.detach().numpy()
+
+        # logits = self.label(x)
+        # return logits
+
+

src/results/results_manager.py

@@ -2,6 +2,6 @@ import pandas as pd
 import numpy as np
 
 df = pd.read_csv("/home/andreapdr/funneling_pdr/src/results/results.csv", delimiter='\t')
-pivot = pd.pivot_table(df, values=['time', 'macrof1', 'microf1', 'macrok', 'microk'], index=['embed'], aggfunc=[np.mean, np.std])
+pivot = pd.pivot_table(df, values=['time', 'macrof1', 'microf1', 'macrok', 'microk'], index=['method', 'embed'], aggfunc=[np.mean, np.std])
 print(pivot)
 print('Finished ...')

src/util/SIF_embed.py

@@ -0,0 +1,56 @@
+import numpy as np
+from sklearn.decomposition import TruncatedSVD
+
+def get_weighted_average(We, x, w):
+    """
+    Compute the weighted average vectors
+    :param We: We[i,:] is the vector for word i
+    :param x: x[i, :] are the indices of the words in sentence i
+    :param w: w[i, :] are the weights for the words in sentence i
+    :return: emb[i, :] are the weighted average vector for sentence i
+    """
+    n_samples = x.shape[0]
+    emb = np.zeros((n_samples, We.shape[1]))
+    for i in range(n_samples):
+        emb[i,:] = w[i,:].dot(We[x[i,:],:]) / np.count_nonzero(w[i,:])
+    return emb
+
+def compute_pc(X,npc=1):
+    """
+    Compute the principal components. DO NOT MAKE THE DATA ZERO MEAN!
+    :param X: X[i,:] is a data point
+    :param npc: number of principal components to remove
+    :return: component_[i,:] is the i-th pc
+    """
+    svd = TruncatedSVD(n_components=npc, n_iter=7, random_state=0)
+    svd.fit(X)
+    return svd.components_
+
+def remove_pc(X, npc=1):
+    """
+    Remove the projection on the principal components
+    :param X: X[i,:] is a data point
+    :param npc: number of principal components to remove
+    :return: XX[i, :] is the data point after removing its projection
+    """
+    pc = compute_pc(X, npc)
+    if npc==1:
+        XX = X - X.dot(pc.transpose()) * pc
+    else:
+        XX = X - X.dot(pc.transpose()).dot(pc)
+    return XX
+
+
+def SIF_embedding(We, x, w, params):
+    """
+    Compute the scores between pairs of sentences using weighted average + removing the projection on the first principal component
+    :param We: We[i,:] is the vector for word i
+    :param x: x[i, :] are the indices of the words in the i-th sentence
+    :param w: w[i, :] are the weights for the words in the i-th sentence
+    :param params.rmpc: if >0, remove the projections of the sentence embeddings to their first principal component
+    :return: emb, emb[i, :] is the embedding for sentence i
+    """
+    emb = get_weighted_average(We, x, w)
+    if  params.rmpc > 0:
+        emb = remove_pc(emb, params.rmpc)
+    return emb

src/util/util.py

@@ -1,2 +1,15 @@
+from sklearn.svm import SVC
+
 def fill_missing_classes(lXtr, lytr):
     pass
+
+def get_learner(calibrate=False, kernel='linear'):
+    return SVC(kernel=kernel, probability=calibrate, cache_size=1000, C=op.set_c, random_state=1, class_weight='balanced', gamma='auto')
+
+
+def get_params(dense=False):
+    if not op.optimc:
+        return None
+    c_range = [1e4, 1e3, 1e2, 1e1, 1, 1e-1]
+    kernel = 'rbf' if dense else 'linear'
+    return [{'kernel': [kernel], 'C': c_range, 'gamma':['auto']}]