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#!/usr/bin/env python3
import csv
from datetime import datetime, timedelta
import numpy as np
import pandas as pd
from Levenshtein import distance as levendist
from sklearn.cluster import DBSCAN
from sklearn.metrics import pairwise_distances
def combine_ocr_logs(video_path, ocr_path, log_path):
date_format = "%Y-%m-%d %H-%M-%S"
video_date = datetime.strptime(video_path.stem, date_format)
print(video_date)
# video_delta = timedelta(hours=video_date.hour, minutes=video_date.minute, seconds=video_date.second)
def add_video_time_to_start(x, video_date):
start = timedelta(seconds=int(round(x)))
return (start + video_date).time().isoformat()
# analysis = pd.read_csv(vp_path / "analysis_results.csv")
analysis = pd.read_csv(ocr_path)
analysis["Starttime"] = analysis["start_time"].apply(
add_video_time_to_start, args=(video_date,)
)
# logs = pd.read_csv(vp_path / f"{vp_path.name}.csv")
logs = pd.read_csv(log_path)
def get_log_url(start_time):
start_time = datetime.strptime(start_time, "%H:%M:%S")
for _, row in logs.iterrows():
log_start = datetime.strptime(row[0], "%H:%M:%S")
log_end = datetime.strptime(row[1], "%H:%M:%S")
if start_time >= log_start and start_time <= log_end:
return row[3]
return 0
analysis["log_url"] = analysis.apply(lambda row: get_log_url(row.Starttime), axis=1)
# analysis.to_csv(vp_path / "merged.csv", quoting=csv.QUOTE_NONNUMERIC)
return analysis
def levendist_normalized(s1, s2, log_url):
return levendist(s1, s2) / len(str(log_url))
def calc_levenshtein_distance(df):
df["levenshtein-distance"] = df.apply(
lambda row: levendist(str(row.url), str(row.log_url)) / len(str(row.log_url)), axis=1
)
return df
def group_urls(urls):
unique_urls = np.unique(urls)
# TODO: casting deprecation np
def levenshtein_from_idx(idx1, idx2):
return levendist(unique_urls[int(idx1)], unique_urls[int(idx2)])
X = np.searchsorted(unique_urls, list([[x] for x in urls]))
distance_matrix = pairwise_distances(
X=X, Y=None, metric=levenshtein_from_idx, n_jobs=-1
)
# TODO: eps and min_samples parameter
db = DBSCAN(eps=10, min_samples=5, metric="precomputed").fit(distance_matrix)
labels = db.labels_
zipped = zip(urls, labels)
# grouping solution from: https://www.geeksforgeeks.org/python-group-tuple-into-list-based-on-value/
# create an empty dictionary to store the grouped tuples
grouped_dict = {}
# loop through the tuples in the list
for tup in zipped:
# get the second element of the tuple
key = tup[1]
# if the key is not already in the dictionary, add it with an empty list as value
if key not in grouped_dict:
grouped_dict[key] = []
# append the current tuple to the list corresponding to the key in the dictionary
grouped_dict[key].append(tup[0])
# convert the dictionary values to lists and store in res
url_groups = [v for _, v in grouped_dict.items()]
return url_groups
# TODO: use df instead of csv reader
# TODO: return df instead of writing to file
def write_grouped_metrics(df, url_groups, data_path):
# # for every row check which group its url belongs to and add a column with group indices
# # also add columns with longest/most frequent url in group
with open(data_path / "metrics.csv", "r") as input_file, open(
data_path / "metrics_grps.csv", "w", newline=""
) as output_file:
csv_reader = csv.reader(input_file, quotechar='"')
csv_writer = csv.writer(
output_file, quotechar='"', quoting=csv.QUOTE_NONNUMERIC
)
header = next(csv_reader)
header.extend(
[
"group_index",
"longest",
"longest-distance",
"most_frequent",
"most_frequent-distance",
]
)
csv_writer.writerow(header)
for row in csv_reader:
ocr_url = row[2]
log_url = row[5]
for idx, grp in enumerate(url_groups):
if ocr_url in grp:
row.append(str(idx))
longest_in_grp = max(grp, key=len)
row.append(longest_in_grp)
row.append(levendist_normalized(log_url, longest_in_grp, log_url))
most_frequent_in_grp = max(set(grp), key=grp.count)
row.append(str(most_frequent_in_grp))
row.append(levendist_normalized(log_url, most_frequent_in_grp, log_url))
csv_writer.writerow(row)
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