def tsne_plot(model, search_word, n_neighbors=10, ax=None):
# Credit for function:
# https://medium.com/@khulasaandh/word-embeddings-fun-with-word2vec-and-game-of-thrones-ea4c24fcf1b8
labels = [bidi.get_display(search_word)]
tokens = [model.wv[search_word]]
similar = [1]
close_words = model.wv.similar_by_word(search_word, topn=n_neighbors)
for word in close_words:
tokens.append(model.wv[word[0]])
labels.append(bidi.get_display(word[0]))
similar.append(word[1])
tsne_model = TSNE(n_components=2, init='pca')
coordinates = tsne_model.fit_transform(tokens)
df = pd.DataFrame({'x': [x for x in coordinates[:, 0]],
'y': [y for y in coordinates[:, 1]],
'words': labels,
'similarity': similar}
)
if ax is None:
_, ax = plt.subplots()
plot = ax.scatter(df.x, df.y, c=df.similarity, cmap='Reds')
for i in range(len(df)):
ax.annotate(" {} ({:.2f})".format(df.words[i].title(),
df.similarity[i]),
(df.x[i], df.y[i]))
plt.colorbar(mappable=plot, ax=ax)
ax.set_title('t-SNE visualization for {}'.format(
bidi.get_display(search_word)))
utils.draw()
def words2sections(G, df, to_plot=False, title=''):
sections = np.unique(df.section)
colors = ('cyan', 'red', 'green', 'lime', 'orange', 'gold',
'grey', 'magenta', 'plum', 'peru')
# assign to each word the section in which it appears the most
for w in G.node:
G.node[w]['section'] = \
sections[np.argmax(['\n'.join(df[df.section==sec].text).count(w)
for sec in sections])]
sections = np.unique([G.node[w]['section'] for w in G.node])
if to_plot:
colors = {sec: colors[i % len(colors)]
for i, sec in enumerate(sections)}
G2 = nx.relabel_nodes(
G, {w: bidi.get_display(w) for w in G.node}, True)
pos = nx.spring_layout(G2)
for sec in sections:
nx.draw_networkx_nodes(G2, pos=pos, node_color=colors[sec],
with_labels=True, label=bidi.get_display(sec),
nodelist=[w for w in G2
if G2.node[w]['section']==sec])
nx.draw_networkx_edges(G2, pos=pos, edge_color='pink')
nx.draw_networkx_labels(G2, pos=pos)
plt.title(title)
plt.legend()
utils.draw()
def perceptron_diagnosis(model, col_names=None, title=None, fig=None,
max_features=50):
# input validation
if len(model.coef_)<=2:
raise NotImplementedError('Binary classification diagnosis is ' +
'currently not supported.')
if fig is None:
fig = plt.subplots(1,1)
plt.figure(fig[0].number)
if col_names is None:
col_names = list(range(len(model.coef_[0])))
col_names = ['intercept'] + [bidi.get_display(nm) for nm in col_names]
# get std of coefficients
coef_std = [np.std(model.intercept_)] + \
[np.std([cfs[i] for cfs in model.coef_])
for i in range(len(model.coef_[0]))]
if max_features:
ids = np.array(coef_std).argsort()[-max_features:][::-1]
col_names = [col_names[i] for i in ids]
coef_std = [coef_std[i] for i in ids]
# plot
pre_title = '' if title is None else title+'\n'
utils.barplot(fig[1], col_names, coef_std, vertical_xlabs=True,
title=pre_title + 'Perceptron Diagnosis ' +
f'({model.n_iter_:d} iterations)',
xlab='Feature', colors=('black',),
ylab='STD(coef) over classes\n' + '(not STD(x*coef)!)')
utils.draw()
def plot_words_repetitions(tab):
f, axs = plt.subplots(1, 1)
axs.plot(list(range(101)),
utils.dist([t[1] for t in tab], list(range(101)))[2:], 'k-')
axs.set_yscale('log')
axs.set_xlim((0, 100))
axs.set_xlabel(f'Quantile [%]\n(100% = {len(tt):d} words)', fontsize=12)
axs.set_ylabel('Repetitions', fontsize=12)
axs.set_title('Frequency of Words in Articles\n' +
'(in Hebrew without stopwords)',
fontsize=14)
utils.draw()
def lengths_analysis(df, by=None):
f, axs = plt.subplots(3, 3)
# remove blocked haaretz texts before analysis
df = df[np.logical_not(df['blocked'])]
# count units
df['words_per_text'] = count_words(df.text)
df['words_per_title'] = count_words(df.title)
df['words_per_subtitle'] = count_words(df.subtitle)
df['characters_per_text'] = [len(s) for s in df.text]
df['sentences_per_text'] = count_sentences(df.text)
df['paragraphs_per_text'] = count_paragraphs(df.text)
df['characters_per_title'] = [len(s) for s in df.title]
df['unique_words_per_100_words'] =\
[100*len(np.unique(list(filter(None,re.split(' |\t|\n\r|\n',s))))) /
len(list(filter(None,re.split(' |\t|\n\r|\n',s))))
for s in df.text]
df['characters_per_word'] =\
[len(s)/len(list(filter(None,re.split(' |\t|\n\r|\n',s))))
for s in df.text]
# plot
columns = ('words_per_text', 'words_per_subtitle', 'words_per_title',
'characters_per_text', 'sentences_per_text', 'paragraphs_per_text',
'characters_per_title', 'unique_words_per_100_words',
'characters_per_word')
for i,col in enumerate(columns):
ax = axs[int(i/3),i%3]
bp = df.boxplot(ax=ax, column=col, by=['source']+([by] if by else []),
return_type='both', patch_artist=True)
colors = np.repeat(('blue','red','green'), int(len(bp[0][1]['boxes'])/3))
for box, color in zip(bp[0][1]['boxes'], colors):
box.set_facecolor(color)
ax.set_xlabel('')#'Source', fontsize=12)
ax.set_ylabel(col.replace('_',' ').capitalize(), fontsize=12)
if by:
ax.set_xticklabels(
[bidi.get_display(
t._text.replace('(', '').replace(')', '').replace(', ', '\n') )
for t in ax.get_xticklabels()],
rotation=90)
if i==0:
ax.set_title('TOKENS COUNT', fontsize=14)
else:
ax.set_title('')
# draw
utils.draw()
def validity_tests(df):
sources = np.unique(df['source'])
blocked_contents = (1-check_haaretz_blocked_text(df[df['source'] == 'haaretz'])\
/ np.sum(df['source']=='haaretz')) * 100
df = df[np.logical_not(df['blocked'])]
n = {src: np.sum(df['source'] == src) for src in sources}
# get anomalies
bad_types = {src: verify_valid(df[df['source']==src],
{'date':datetime,'blocked':np.bool_})
for src in sources}
bad_lengths = {src: check_lengths(df[df['source']==src]) for src in sources}
bad_tokens = {src: verify_hebrew_words(df[df['source']==src]) for src in sources}
# plot anomalies
f, axs = plt.subplots(3, len(sources))
for i, src in enumerate(sources):
tit = ('DATA SANITY TESTS\n' if i==int(len(sources)/2) else '\n') +\
f'[{src:s}] Invalid field types' +\
(f'\n(out of {blocked_contents:.0f}% unblocked articles)'
if src=='haaretz' else '\n')
utils.barplot(axs[0, i], bad_types[src].keys(),
100 * np.array(tuple(bad_types[src].values())) / n[src],
vertical_xlabs=True, title=tit,
ylab='Having invalid type [%]', ylim=(0, 100))
sp = inspect.getfullargspec(check_lengths)
limits = list(itertools.chain.from_iterable(sp[3][0].values()))
for i, src in enumerate(sources):
utils.barplot(axs[1, i],
[a+f'\n({b:.0f} chars)' for a,b in
zip(bad_lengths[src].keys(),limits)],
100 * np.array(tuple(bad_lengths[src].values())) / n[src],
vertical_xlabs=True,
title=f'[{src:s}] Suspicious string-field lengths',
ylab='Having invalid length [%]', ylim=(0, 100))
utils.barplot(axs[2,0], sources, [100*(1-bad_tokens[src][0]) for src in sources],
xlab='Source', ylab='Words without numbers\nor Hebrew letters [%]')
utils.barplot(axs[2,1], sources, [100*(1-bad_tokens[src][1]) for src in sources],
xlab='Source', ylab='Words of length <=1 [%]')
for i in range(2,len(sources)):
utils.clean_figure(axs[2,i])
# draw
utils.draw()
def plot_results(res, axs, title='Test Classification', reference=None):
for i,test in enumerate(res):
ax = axs[i]
n_samples = res[test][0]
# plot reference
if reference is not None:
ax.plot((n_samples[0], n_samples[-1]),
2 * [reference],
'k--', label='Random')
# plot actual results
for model in res[test][1]:
accuracy = res[test][1][model]
ax.plot(n_samples, accuracy, label=model)
ax.set_title(title + f'\n({test:s})', fontsize=14)
ax.set_xlabel('Training samples', fontsize=12)
ax.set_ylabel('Accuracy [%]', fontsize=12)
ax.set_xlim((n_samples[0],n_samples[-1]))
ax.set_ylim((0,101))
ax.grid(color='k', linestyle=':', linewidth=1)
ax.legend(loc='upper left')
utils.draw()
def data_description(df):
sources = np.unique(df['source'])
n = len(sources)
f, axs = plt.subplots(2, n)
# counters per source
bar_per_source(axs[0,0], df, ylab='Articles\n(black = partially blocked contents)',
fun=lambda d: d.shape[0], title='\nArticles per Source')
bar_per_source(axs[0,1], df,
ylab='Words [x1000]\n(black = partially blocked contents)',
fun=lambda d: sum(len(l.split()) for t in d['text'].values
for l in t.split('\n')) / 1e3,
title='BASIC DATA DESCRIPTION\nWords per Source')
# remove blocked haaretz texts before next analysis
df = df[np.logical_not(df['blocked'])]
# sections per source
articles_per_section =\
[df[np.logical_and(df.source==src,df.section==sec)].shape[0]
for src in sources
for sec in np.unique(df[df.source==src].section)]
axs[0,2].pie([df[df.source==src].shape[0] for src in sources],
labels=sources, colors=utils.DEF_COLORS[:3], startangle=90,
frame=True, counterclock=False)
patches,_ = axs[0,2].pie(articles_per_section,
radius=0.75, startangle=90, counterclock=False)
centre_circle =\
plt.Circle((0, 0), 0.5, color='black', fc='white', linewidth=0)
axs[0,2].add_artist(centre_circle)
axs[0,2].set_title('\nSources and Sections', fontsize=14)
axs[0,2].legend(
patches, [bidi.get_display(sec) for src in sources
for sec in np.unique(df[df.source==src].section)],
ncol=5, loc='upper right', bbox_to_anchor=(1, 0.11), fontsize=8 )
# dates & authors
date_hist(axs[1,0], df)
author_concentration(axs[1,1], df)
top_authors(axs[1,2], df)
# draw
utils.draw()
def naive_bayes_diagnosis(model, col_names=None, title=None, fig=None,
max_features=50):
# input validation
if fig is None:
fig = plt.subplots(1,1)
plt.figure(fig[0].number)
if col_names is None:
col_names = list(range(len(model.feature_importances)))
col_names = [bidi.get_display(nm) for nm in col_names]
# get std of coefficients
log_probs_std = [np.std([lp[i] for lp in model.feature_log_prob_])
for i in range(len(model.feature_log_prob_[0]))]
if max_features:
ids = np.array(log_probs_std).argsort()[-max_features:][::-1]
col_names = [col_names[i] for i in ids]
log_probs_std = [log_probs_std[i] for i in ids]
# plot
pre_title = '' if title is None else title+'\n'
utils.barplot(fig[1], col_names, log_probs_std, vertical_xlabs=True,
title=pre_title+f'Naive Bayes Diagnosis',
xlab='Feature', colors=('black',),
ylab='STD(log probability)\nover classes')
utils.draw()
def random_forest_diagnosis(model, col_names=None, title=None, fig=None,
max_features=50):
# input validation
if fig is None:
fig = plt.subplots(1,1)
plt.figure(fig[0].number)
if col_names is None:
col_names = list(range(len(model.feature_importances_)))
col_names = [bidi.get_display(nm) for nm in col_names]
# get importance
importance = model.feature_importances_
if max_features:
ids = np.array(importance).argsort()[-max_features:][::-1]
col_names = [col_names[i] for i in ids]
importance = [importance[i] for i in ids]
# plot
pre_title = '' if title is None else title+'\n'
utils.barplot(fig[1], col_names, importance, vertical_xlabs=True,
title=pre_title + 'Random Forest Diagnosis ' +
f'({len(model.estimators_):d} trees)',
xlab='Feature', colors=('black',),
ylab='Gini importance')
utils.draw()
def count_parties(
ax,
df,
col='text',
by='source',
binary_per_text=False,
logscale=False,
keys=('ליכוד', ('ביבי', 'נתניהו'), ('כחול לבן', 'כחול-לבן'), 'גנץ',
'העבודה', 'גבאי', ('חד"ש', 'תע"ל'), 'עודה', 'יהדות התורה', 'ליצמן',
'איחוד הימין', "סמוטריץ'", 'הימין החדש', 'בנט', 'זהות', 'פייגלין',
'מרצ', 'זנדברג', 'ש"ס', 'דרעי', 'כולנו', 'כחלון', ('בל"ד', 'רע"ם'),
'עבאס', ('ישראל ביתנו',
'ישראל-ביתנו'), 'ליברמן', 'גשר', 'אורלי לוי')):
groups = np.unique(df[by])
sep = SEPARATOR['word']
count = {grp: len(keys) * [0] for grp in groups}
for grp in groups:
for i, txt in enumerate(df[df[by] == grp][col]):
for j, key in enumerate(keys):
# multi-word keys
appears = 0
if isinstance(key, tuple):
for k in key:
if ' ' in k:
appears = txt.count(k)
count[grp][j] += bool(
appears) if binary_per_text else appears
if binary_per_text: break
else:
k = key
if ' ' in k:
appears = txt.count(k)
count[grp][j] += bool(
appears) if binary_per_text else appears
if binary_per_text and appears:
continue
# one-word keys
for w in re.split(sep, txt):
w = re.sub('\.|,|\(|\)|;|:|\t', '', w).strip()
if w.endswith(key):
count[grp][j] += 1
if binary_per_text: break
keys = tuple(k[0] + ' /\n' + k[1] if isinstance(k, tuple) else k
for k in keys)
keys = tuple(bidi.get_display(k) for k in keys)
colors = utils.DEF_COLORS
bottom = np.array([0 for _ in keys])
ylab = ('Texts with the expression' if binary_per_text else 'Total appearances') +\
'\n(as end of a word)'
for i, group in enumerate(groups):
utils.barplot(ax,
keys,
count[group],
bottom=bottom,
plot_bottom=False,
ylab=ylab,
title='Frequency of appearance',
vertical_xlabs=True,
colors=colors[i % len(colors)],
label=bidi.get_display(group))
bottom += count[group]
if logscale:
ax.set_yscale('log')
ax.legend()
utils.draw()
