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evaluations.py
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evaluations.py
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import numpy as np
from relations import Relations
def pretty_print_eval_map(result_map):
s,_ = pretty_print_eval_map_rec(result_map, '')
return s
def pretty_print_eval_map_rec(result_map, spaces):
assert type(result_map) is dict
if type(list(result_map.values())[0]) is str or type(list(result_map.values())[0]) is int:
return '; '.join(str(k) + ': ' + str(v) for k,v in result_map.items()) + '\n', True
s = ''
for k,v in result_map.items():
pretty_v , is_leaf = pretty_print_eval_map_rec(v, spaces + ' ')
if is_leaf:
s += spaces + str(k) + ': ' + pretty_v
else:
s += spaces + str(k) + ': \n' + pretty_v
return s, False
def eval_classification(
logger, task, valid_pos_path, valid_neg_path, test_pos_path, test_neg_path, vocab, score_fn, alphas_to_validate):
"""
Evaluates edge classification based on a scoring function.
:param score_fn(alpha, parent_index, other_indices=None, rel_reversed):
Function that scores each edge (u,v), v in other_nodes. The lower score means the higher the chance
the edge exists. One example of such function is the score(is-a(u,v)) from the Poincare embeddings" paper.
"""
if valid_pos_path == test_pos_path:
assert valid_neg_path == test_neg_path
assert task == 'reconstruction'
if task != 'reconstruction':
assert valid_neg_path != test_neg_path
results = {task: {}}
res = results[task]
valid_eval_obj = _EvalObj(logger, valid_pos_path, valid_neg_path, vocab)
test_eval_obj = _EvalObj(logger, test_pos_path, test_neg_path, vocab)
###### Perform validation
best_alpha = None
best_valid_f1 = -1
best_optimal_th = None
for alpha in alphas_to_validate:
logger.info('now validating alpha = ' + str(alpha))
optimal_th, optimal_valid_f1 = \
valid_eval_obj.find_best_classification_thresh_F1(score_fn=score_fn, alpha=alpha) ##### Expensive
if optimal_valid_f1 > best_valid_f1:
best_valid_f1 = optimal_valid_f1
best_alpha = alpha
best_optimal_th = optimal_th
###### Done validation
best_key = 'alpha=' + str(best_alpha)
res[best_key] = {}
res[best_key]['VALID'] =\
valid_eval_obj.evaluate_classification(score_fn=score_fn,
alpha=best_alpha,
threshold=best_optimal_th)
res[best_key]['TEST'] = \
test_eval_obj.evaluate_classification(score_fn=score_fn,
alpha=best_alpha,
threshold=best_optimal_th)
best_test_f1 = res[best_key]['TEST']['f1']
best_valid_f1 = res[best_key]['VALID']['f1']
return results, best_alpha, float(best_optimal_th), float(best_test_f1), float(best_valid_f1)
class _EvalObj(object):
"""Evaluating reconstruction on given network for given embedding."""
def __init__(self, logger, positive_rel_filepath, negative_rel_filepath, vocab):
self.logger = logger
self.pos_relations_parents = []
self.pos_relations_children = []
rels = Relations(positive_rel_filepath, reverse=False)
for node_parent, node_child in rels:
assert node_parent != node_child
node_parent_idx = vocab[node_parent].index
node_child_idx = vocab[node_child].index
self.pos_relations_parents.append(node_parent_idx)
self.pos_relations_children.append(node_child_idx)
self.neg_relations_parents = []
self.neg_relations_children = []
rels = Relations(negative_rel_filepath, reverse=False)
for node_parent, node_child in rels:
assert node_parent != node_child
node_parent_idx = vocab[node_parent].index
node_child_idx = vocab[node_child].index
self.neg_relations_parents.append(node_parent_idx)
self.neg_relations_children.append(node_child_idx)
logger.info('eval datasets file pos = ' + positive_rel_filepath + ' neg = ' + negative_rel_filepath +
'; eval num rels pos = ' + str(len(self.pos_relations_parents)) + ' neg = ' + str(len(self.neg_relations_parents)))
def evaluate_classification(self, score_fn, alpha, threshold):
"""Evaluates P, R, F1 and Acc for link prediction.
Parameters
-------
score_fn(alpha, parent_index, other_indices=None, rel_reversed) :
Scores each edge (u,v), v in other_nodes. The lower score means the higher the chance
the edge exists. The higher, the lower.
threshold :
Threshold for the scores. What is below is classified as an edge. What is above is not an edge.
"""
pos_scores = score_fn(alpha, self.pos_relations_parents, self.pos_relations_children, False)
tp = (pos_scores <= threshold).sum()
fn = (pos_scores > threshold).sum()
neg_scores = score_fn(alpha, self.neg_relations_parents, self.neg_relations_children, False)
fp = (neg_scores <= threshold).sum()
precision = 100 * tp / (tp + fp + 1e-6)
recall = 100 * tp / (tp + fn + 1e-6)
f1 = 2 * precision * recall / (precision + recall + 1e-6)
return {'precision': ('%.1f' % precision), 'recall': ('%.1f' % recall), 'f1': ('%.1f' % f1)}
def find_best_classification_thresh_F1(self, score_fn, alpha):
"""Like in the Order Embeddings paper, we find the best classification threshold
Parameters
-------
score_fn(alpha, parent_index, other_indices=None, rel_reversed) :
Scores each edge (u,v), v in other_nodes. The lower score means the higher the chance
the edge exists. The higher, the lower.
"""
# Vector of type (label, score) for each edge or non-edge in our dataset.
all_labels_and_scores = []
num_grd_trth_pos = len(self.pos_relations_parents)
pos_scores = score_fn(alpha, self.pos_relations_parents, self.pos_relations_children, False)
neg_scores = score_fn(alpha, self.neg_relations_parents, self.neg_relations_children, False)
all_labels_and_scores.extend(zip(pos_scores, np.ones(len(pos_scores))))
all_labels_and_scores.extend(zip(neg_scores, np.zeros(len(neg_scores))))
# print("##### pos")
# print(pos_scores)
# print("##### neg")
# print(neg_scores)
# print("######################")
# print(all_labels_and_scores)
# Sort scores. In case of equal scores, put the negatives (0-labels) first.
all_labels_and_scores = sorted(all_labels_and_scores) #### Expensive, O(n * log n)
# print("##### sorted")
# print(all_labels_and_scores)
tp = 0.0
fp = 0.0
best_th = 0.0
best_f1 = -1
for score,label in all_labels_and_scores:
tp += label
fp += (1.0 - label)
precision = 100 * tp / (tp + fp + 1e-6)
recall = 100 * tp / (num_grd_trth_pos)
f1 = 2 * precision * recall / (precision + recall + 1e-6)
if f1 > best_f1:
best_f1 = f1
best_th = score
print("### th", best_th)
print("### f1", best_f1)
return best_th, best_f1