def get_binned_sentence_features(data, number_of_bins):
sentence_features = []
for sentence in data:
sentence_features.append([
get_word_features(word) for word in sentence.word
if is_real_word(word)
])
bins = []
for n_feature in np.arange(N_ET_FEATURES):
all_values_this_feature = []
for sentence in sentence_features:
all_values_this_feature.extend(
[word[n_feature] for word in sentence])
bin = np.percentile(all_values_this_feature,
q=np.linspace(100 / number_of_bins, 100,
number_of_bins))
bin[number_of_bins - 1] += 1
bins.append(bin)
binned_sentence_features = []
for sentence in sentence_features:
sentence_2d_array = np.array(sentence)
for n_feature in np.arange(N_ET_FEATURES):
sentence_2d_array[:, n_feature] = np.digitize(
sentence_2d_array[:, n_feature], bins[n_feature])
binned_sentence_features.append(sentence_2d_array.astype(int))
return binned_sentence_features
def get_sentence_features(sentence):
sentence_features = [
get_word_features(word) for word in sentence.word if is_real_word(word)
]
return np.array([
np.zeros(N_ELECTRODES) if sf is None else sf
for sf in sentence_features
])
def get_normalized_sentence_features(sentence, normalization_values):
# Get and normalize word features for each sentence
mu, sigma = normalization_values['mu'], normalization_values['sigma']
sentence_features = [
get_word_features(word) for word in sentence.word if is_real_word(word)
]
sentence_features = np.array(sentence_features)
# Center and rescale
centered_sentence_features = sentence_features - normalization_values['mu']
return centered_sentence_features / sigma
def get_power_spectrum_sentence_features(sentence, eeg_config):
sentence_features = [
get_power_spectrum_word_features(word, eeg_config)
for word in sentence.word if is_real_word(word)
]
sentence_features_with_value = [
sf for sf in sentence_features if sf.size > 0
]
if len(sentence_features_with_value) > 0:
default_value = np.mean([sentence_features_with_value], axis=1)
else:
default_value = np.zeros(N_ELECTRODES * N_FREQUENCY_BANDS)
return np.vstack(
[default_value if sf.size == 0 else sf for sf in sentence_features])
def get_normalized_sentence_features(sentence, normalization_values):
#Get and normalize word features for each sentence
mu, sigma = normalization_values['mu'], normalization_values['sigma']
sentence_features = [
get_word_features(word) for word in sentence.word if is_real_word(word)
]
#Replace non-fixated by averages
sentence_features = np.array(
[mu if sf is None else sf for sf in sentence_features])
#Center, remove outliers and rescale
centered_sentence_features = sentence_features - normalization_values['mu']
# TODO: assigning mu here appears to be a mistake, perhaps it shall be modified to 0? Will do, consider re-evaluating in future.
#filtered_sentence_features = np.where(np.abs(centered_sentence_features) < MAX_OUTLIER_TOLERANCE * sigma, centered_sentence_features, mu)
filtered_sentence_features = np.where(
np.abs(centered_sentence_features) < MAX_OUTLIER_TOLERANCE * sigma,
centered_sentence_features, 0)
return filtered_sentence_features / (MAX_OUTLIER_TOLERANCE * sigma)
def get_normalization_values(data):
# Get average and std for each electrode
sentence_features = []
for sentence in data:
sentence_features.append([
get_word_features(word) for word in sentence.word
if is_real_word(word)
])
mu, sigma = [], []
for n_feature in np.arange(N_ET_FEATURES):
all_values_this_feature = []
for sentence in sentence_features:
all_values_this_feature.extend(
[word[n_feature] for word in sentence])
mu.append(np.average(all_values_this_feature))
sigma.append(np.max([np.std(all_values_this_feature), 0.0001]))
return np.array(mu), np.array(sigma)
def get_normalization_values(data):
#Get average and std for each electrode
sentence_features = []
count = 0
for sentence in data:
#print("Sentence position: " + str(count))
sentence_features.append([
get_word_features(word) for word in sentence.word
if is_real_word(word)
])
#sentence_features.append([get_word_features(word) for word in sentence.word if is_real_word(word) and hasattr(word, 'rawEEG') and word.rawEEG.size != 0])
count += 1
mu, sigma = [], []
for n_electrode in np.arange(N_ELECTRODES):
all_voltages_electrode = []
for sentence in sentence_features:
all_voltages_electrode.extend(
[word[n_electrode] for word in sentence if word is not None])
mu.append(np.average(all_voltages_electrode))
sigma.append(np.max([np.std(all_voltages_electrode), 0.0001]))
return np.array(mu), np.array(sigma)
def count_words(word_array):
return sum(1 for i in range(len(word_array))
if is_real_word(word_array[i]))
