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| from scipy.spatial.distance import cosine | |
| import argparse | |
| import json | |
| import pdb | |
| import torch | |
| import torch.nn.functional as F | |
| import numpy as np | |
| import time | |
| from collections import OrderedDict | |
| class TWCClustering: | |
| def __init__(self): | |
| print("In Zscore Clustering") | |
| def compute_matrix(self,embeddings): | |
| #print("Computing similarity matrix ...)") | |
| embeddings= np.array(embeddings) | |
| start = time.time() | |
| vec_a = embeddings.T #vec_a shape (1024,) | |
| vec_a = vec_a/np.linalg.norm(vec_a,axis=0) #Norm is along axis 0 - rows | |
| vec_a = vec_a.T #vec_a shape becomes (,1024) | |
| similarity_matrix = np.inner(vec_a,vec_a) | |
| end = time.time() | |
| time_val = (end-start)*1000 | |
| #print(f"Similarity matrix computation complete. Time taken:{(time_val/(1000*60)):.2f} minutes") | |
| return similarity_matrix | |
| def get_terms_above_threshold(self,matrix,embeddings,pivot_index,threshold): | |
| run_index = pivot_index | |
| picked_arr = [] | |
| while (run_index < len(embeddings)): | |
| if (matrix[pivot_index][run_index] >= threshold): | |
| #picked_arr.append({"index":run_index,"val":matrix[pivot_index][run_index]}) | |
| picked_arr.append({"index":run_index}) | |
| run_index += 1 | |
| return picked_arr | |
| def update_picked_dict(self,picked_dict,in_dict): | |
| for key in in_dict: | |
| picked_dict[key] = 1 | |
| def find_pivot_subgraph(self,pivot_index,arr,matrix,threshold): | |
| center_index = pivot_index | |
| center_score = 0 | |
| center_dict = {} | |
| for i in range(len(arr)): | |
| node_i_index = arr[i]["index"] | |
| running_score = 0 | |
| temp_dict = {} | |
| for j in range(len(arr)): | |
| node_j_index = arr[j]["index"] | |
| cosine_dist = matrix[node_i_index][node_j_index] | |
| if (cosine_dist < threshold): | |
| continue | |
| running_score += cosine_dist | |
| temp_dict[node_j_index] = cosine_dist | |
| if (running_score > center_score): | |
| center_index = node_i_index | |
| center_dict = temp_dict | |
| center_score = running_score | |
| sorted_d = OrderedDict(sorted(center_dict.items(), key=lambda kv: kv[1], reverse=True)) | |
| return {"pivot_index":center_index,"orig_index":pivot_index,"neighs":sorted_d} | |
| def update_overlap_stats(self,overlap_dict,cluster_info): | |
| arr = list(cluster_info["neighs"].keys()) | |
| for val in arr: | |
| if (val not in overlap_dict): | |
| overlap_dict[val] = 1 | |
| else: | |
| overlap_dict[val] += 1 | |
| def bucket_overlap(self,overlap_dict): | |
| bucket_dict = {} | |
| for key in overlap_dict: | |
| if (overlap_dict[key] not in bucket_dict): | |
| bucket_dict[overlap_dict[key]] = 1 | |
| else: | |
| bucket_dict[overlap_dict[key]] += 1 | |
| sorted_d = OrderedDict(sorted(bucket_dict.items(), key=lambda kv: kv[1], reverse=False)) | |
| return sorted_d | |
| def cluster(self,output_file,texts,embeddings,threshold = 1.5): | |
| matrix = self.compute_matrix(embeddings) | |
| mean = np.mean(matrix) | |
| std = np.std(matrix) | |
| zscores = [] | |
| inc = 0 | |
| value = mean | |
| while (value < 1): | |
| zscores.append({"threshold":inc,"cosine":round(value,2)}) | |
| inc += 1 | |
| value = mean + inc*std | |
| #print("In clustering:",round(std,2),zscores) | |
| cluster_dict = {} | |
| cluster_dict["clusters"] = [] | |
| picked_dict = {} | |
| overlap_dict = {} | |
| for i in range(len(embeddings)): | |
| if (i in picked_dict): | |
| continue | |
| zscore = mean + threshold*std | |
| arr = self.get_terms_above_threshold(matrix,embeddings,i,zscore) | |
| cluster_info = self.find_pivot_subgraph(i,arr,matrix,zscore) | |
| self.update_picked_dict(picked_dict,cluster_info["neighs"]) | |
| self.update_overlap_stats(overlap_dict,cluster_info) | |
| cluster_dict["clusters"].append(cluster_info) | |
| curr_threshold = f"{threshold} (cosine:{mean+threshold*std:.2f})" | |
| sorted_d = OrderedDict(sorted(overlap_dict.items(), key=lambda kv: kv[1], reverse=True)) | |
| #print(sorted_d) | |
| sorted_d = self.bucket_overlap(overlap_dict) | |
| cluster_dict["info"] ={"mean":mean,"std":std,"current_threshold":curr_threshold,"zscores":zscores,"overlap":list(sorted_d.items())} | |
| return cluster_dict | |