main.py 7.39 KB
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from flask import Flask, jsonify, request
import pandas as pd
import numpy as np
from flask_cors import CORS
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from collections import defaultdict, Counter
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from time import time
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import os.path
import json
from sklearn import preprocessing
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import orjson
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import dask.dataframe as dd
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app = Flask(__name__)
CORS(app)

@app.route('/', methods=['GET'])
def index():
    return "hi"

@app.route('/read-data', methods=['GET'])
def read_data():
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    filename = 'data.pkl'
    if (not os.path.isfile(filename)):
        print("start")
        df = dd.read_csv("NW_Ground_Stations_2016.csv", usecols=['number_sta', 'date', 't'])
        print("read file")
        df = df.loc[df['number_sta'] == 14066001]
        print("split rows")
        df = df.compute()
        df.to_pickle(filename)
        print("to_pandas")
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    df = pd.read_pickle(filename)
    df.dropna(subset=['t'], inplace=True)
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    response = {
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        "index": json.dumps(df.loc[:, 'date'].values.astype(str).tolist()),
        "values": json.dumps(df.loc[:, 't'].values.astype(str).tolist())
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    }
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    print("response ready")
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    response = jsonify(response)
    return response

@app.route('/create-windows', methods=['POST'])
def create_windows():
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    t0 = time()
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    if (not os.path.isfile('processed-data.npy')):
        filename = 'data.pkl'
        df = pd.read_pickle(filename)
        values = df.loc[:, 't'].values.astype(str).tolist()
        print("Data read: " + str(time()-t0))
        raw_data = request.json
        window_size = int(raw_data['parameters']["windowsize"])
        print("Processing: " + str(time()-t0))
        data = [values[i:i+window_size] for i in range(len(values) - window_size)]
        data = preprocessing.minmax_scale(data, (-1, 1), axis=1)
        print("Preprocessed: " + str(time()-t0))
        np.save('processed-data', data)
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    print("Sending response: " + str(time()-t0))
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    return '1'
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@app.route('/create-tables', methods=['POST'])
def create_tables():
    t0 = time()
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    print("loading")
    data = np.load('processed-data.npy')
    print(time()-t0)
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    raw_data = orjson.loads(request.data)
    print(time()-t0)
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    window_size = int(raw_data['parameters']["windowsize"])
    hash_size = int(raw_data['parameters']["hashsize"])
    table_size = int(raw_data['parameters']["tablesize"])
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    data = np.array(data)
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    print('Starting: ' + str(time()-t0))
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    tables_hash_function = [np.random.uniform(-1, 1, size=(window_size, hash_size)) for _ in range(table_size)]
    print('Init time: ' + str(time() - t0))
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    tables = []
    for index in range(table_size):
        t1 = time()
        table = defaultdict(list)
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        signatures_bool = np.dot(data, tables_hash_function[index]) > 0
        signatures = [''.join(['1' if x else '0' for x in lst]) for lst in signatures_bool]
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        for i in range(len(signatures)):
            table[signatures[i]].append(i)
        print(time()-t1)
        tables.append(table)
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    print('Creation time: ' + str(time() - t0))
    hash_functions = np.array(tables_hash_function).tolist()
    response = {}
    for table_index in range(table_size):
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        response[str(table_index)] = {
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            "hash": hash_functions[table_index],
            "entries": tables[table_index]
        }
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    response = orjson.dumps(response)
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    return response

@app.route('/query', methods=['POST'])
def query():
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    t0 = time()
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    raw_data = orjson.loads(request.data)
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    query = raw_data['query']
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    tables = raw_data["tables"]
    neighbours = []
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    data = np.load('processed-data.npy')
    window = data[query]
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    output = defaultdict(list)
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    for t in tables.values():
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        signature = ''.join((np.dot(window, t["hash"]) > 0).astype('int').astype('str'))
        neighbours.extend(t["entries"][signature])
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    neighbours_with_frequency = dict(Counter(neighbours))
    for index, frequency in neighbours_with_frequency.items():
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        output[str(frequency)].append(index)
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    response = orjson.dumps(output)
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    print("Query done: " + str(time()-t0))
    return response

@app.route('/average', methods=['POST'])
def average():
    t0 = time()
    raw_data = orjson.loads(request.data)
    all_windows = raw_data['windows']
    data = np.load('processed-data.npy')
    output = []
    for windows in all_windows:
        t1 = time()
        actual_windows = data[windows]
        output.append((np.sum(actual_windows, 0)/len(actual_windows)).tolist())
        #output.append([(sum(x)/len(actual_windows)).item() for x in zip(*actual_windows)])
        print("Average calculated: " + str(time() - t1))
    response = orjson.dumps(output)
    print("Average calculated: " + str(time() - t0))
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    return response

@app.route('/update', methods=['POST'])
def update():
    t0 = time()
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    print("Start")
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    raw_data = orjson.loads(request.data)
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    print("Data loaded: " + str(time() - t0))
    data = np.load('processed-data.npy')
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    label_data = raw_data["labelData"]
    tables = raw_data["tables"]

    window_size = int(raw_data['parameters']["windowsize"])
    hash_size = int(raw_data['parameters']["hashsize"])
    table_size = int(raw_data['parameters']["tablesize"])
    new_tables = []

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    correct_indices = [int(index) for index, value in label_data.items() if value is True]
    incorrect_indices = [int(index) for index, value in label_data.items() if value is False]
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    window = data[correct_indices[0]]
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    print("Initialized: " + str(time() - t0))
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    for t in tables.values():
        valid = True
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        signature = ''.join((np.dot(window, t["hash"]) > 0).astype('int').astype('str'))
        neighbours = t["entries"][signature]
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        for index in correct_indices:
            if index not in neighbours:
                valid = False
                break
        for index in incorrect_indices:
            if index in neighbours:
                valid = False
                break
        if valid:
            new_tables.append(t)
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    print("Filtered good tables: " + str(time() - t0))
    for index in range(table_size - len(new_tables)):
        entries = defaultdict(list)
        t1 = time()
        while True:
            hash_function = np.random.randn(window_size, hash_size)
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            correct_signatures = [''.join((np.dot(data[i], hash_function) > 0).astype('int').astype('str')) for
                                  i in
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                                  correct_indices]
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            incorrect_signatures = [''.join((np.dot(data[i], hash_function) > 0).astype('int').astype('str')) for
                                    i
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                                    in incorrect_indices]
            if correct_signatures.count(correct_signatures[0]) == len(
                    correct_signatures) and incorrect_signatures.count(
                    correct_signatures[0]) == 0:
                break
        print("first: " + str(time() - t1))
        t2 = time()
        signatures_bool = np.dot(data, hash_function) > 0
        signatures = [''.join(['1' if x else '0' for x in lst]) for lst in signatures_bool]
        for i in range(len(signatures)):
            entries[signatures[i]].append(i)
        print("second: " + str(time() - t2))
        new_tables.append({
            "hash": hash_function.tolist(),
            "entries": entries
        })
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    print('Update time: ' + str(time() - t0))
    response = {}
    for table_index in range(len(new_tables)):
        response[table_index] = {
            "hash": new_tables[table_index]["hash"],
            "entries": new_tables[table_index]["entries"]
        }
    response = jsonify(response)
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    return response