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#import required python modules |
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import numpy as np |
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from numpy import genfromtxt |
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import pandas as pd |
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import matplotlib.pyplot as plt |
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from os import listdir |
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import os.path |
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import urllib.request |
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import zipfile |
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import keras |
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from keras.utils.np_utils import to_categorical |
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def split_activities(labels, X, borders=10*100): |
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""" |
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Splits up the data per activity and exclude activity=0. |
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Also remove borders for each activity. |
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Returns lists with subdatasets |
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""" |
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tot_len = len(labels) |
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startpoints = np.where([1] + [labels[i]!=labels[i-1] for i in range(1, tot_len)])[0] |
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endpoints = np.append(startpoints[1:]-1, tot_len-1) |
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acts = [labels[s] for s,e in zip(startpoints, endpoints)] |
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#Also split up the data, and only keep the non-zero activities |
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Xysplit = [(X[s+borders:e-borders+1,:], a) for s,e,a in zip(startpoints, endpoints, acts) if a != 0] |
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Xysplit = [(X, y) for X,y in Xysplit if len(X)>0] |
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Xlist = [X for X,y in Xysplit] |
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ylist = [y for X,y in Xysplit] |
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return Xlist, ylist |
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def sliding_window(frame_length, step, Xsamples, ysamples,ysampleslist,Xsampleslist): |
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""" |
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Splits time series in ysampleslist and Xsampleslist |
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into segments by applying a sliding overlapping window |
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of size equal to frame_length with steps equal to step |
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it does this for all the samples and appends all the output together. |
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So, the participant distinction is not kept |
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""" |
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for j in range(len(Xsampleslist)): |
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X = Xsampleslist[j] |
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ybinary = ysampleslist[j] |
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for i in range(0, X.shape[0]-frame_length, step): |
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Xsub = X[i:i+frame_length,:] |
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ysub = ybinary |
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Xsamples.append(Xsub) |
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ysamples.append(ysub) |
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def transform_y(y,mapclasses,nr_classes): |
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""" |
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Transforms y, a tuple with sequences of class per time segment per sample, |
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into a binary matrix per sample |
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""" |
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ymapped = np.array([mapclasses[c] for c in y], dtype='int') |
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ybinary = to_categorical(ymapped, nr_classes) |
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return ybinary |
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def addheader(datasets): |
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""" |
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The columns of the pandas data frame are numbers |
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this function adds the column labels |
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""" |
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axes = ['x', 'y', 'z'] |
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IMUsensor_columns = ['temperature'] + \ |
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['acc_16g_' + i for i in axes] + \ |
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['acc_6g_' + i for i in axes] + \ |
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['gyroscope_'+ i for i in axes] + \ |
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['magnometer_'+ i for i in axes] + \ |
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['orientation_' + str(i) for i in range(4)] |
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header = ["timestamp", "activityID", "heartrate"] + ["hand_"+s for s in IMUsensor_columns]\ |
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+ ["chest_"+s for s in IMUsensor_columns]+ ["ankle_"+s for s in IMUsensor_columns] |
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for i in range(0,len(datasets)): |
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datasets[i].columns = header |
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return datasets |
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def split_dataset(datasets_filled,Xlists,ybinarylists): |
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""" |
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This function split Xlists and ybinarylists into |
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a train, test and val subset |
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""" |
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train_range = slice(0, 6) |
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val_range = 6 |
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test_range = slice(7,len(datasets_filled)) |
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Xtrainlist = [X for Xlist in Xlists[train_range] for X in Xlist] |
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Xvallist = [X for X in Xlists[val_range]] |
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Xtestlist = [X for Xlist in Xlists[test_range] for X in Xlist] |
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ytrainlist = [y for ylist in ybinarylists[train_range] for y in ylist] |
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yvallist = [y for y in ybinarylists[val_range]] |
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ytestlist = [y for ylist in ybinarylists[test_range] for y in ylist] |
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return Xtrainlist, Xvallist, Xtestlist, ytrainlist, yvallist, ytestlist |
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def numpify_and_store(x,y,Xname,yname,outdatapath,shuffle=False): |
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""" |
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Converts python lists x and y into numpy arrays |
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and stores the numpy array in directory outdatapath |
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shuffle is optional and shuffles the samples |
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""" |
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x = np.array(x) |
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y = np.array(y) |
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#Shuffle around the train set |
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if shuffle is True: |
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np.random.seed(123) |
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neworder = np.random.permutation(x.shape[0]) |
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x = x[neworder,:,:] |
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y = y[neworder,:] |
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# Save binary file |
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np.save(outdatapath+ Xname, x) |
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np.save(outdatapath+ yname, y) |
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def fetch_data(directory_to_extract_to): |
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""" |
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Fetch the data and extract the contents of the zip file |
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to the directory_to_extract_to. |
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First check whether this was done before, if yes, then skip |
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""" |
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targetdir = directory_to_extract_to + '/PAMAP2' |
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if os.path.exists(targetdir): |
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print('Data previously downloaded and stored in ' + targetdir) |
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else: |
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os.makedirs(targetdir) # create target directory |
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#download the PAMAP2 data, this is 688 Mb |
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path_to_zip_file = directory_to_extract_to + '/PAMAP2_Dataset.zip' |
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test_file_exist = os.path.isfile(path_to_zip_file) |
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if test_file_exist is False: |
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url = 'https://archive.ics.uci.edu/ml/machine-learning-databases/00231/PAMAP2_Dataset.zip' |
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#retrieve data from url |
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local_fn, headers = urllib.request.urlretrieve(url,filename=path_to_zip_file) |
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print('Download complete and stored in: ' + path_to_zip_file ) |
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else: |
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print('The data was previously downloaded and stored in ' + path_to_zip_file ) |
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# unzip |
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with zipfile.ZipFile(path_to_zip_file ,"r") as zip_ref: |
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zip_ref.extractall(targetdir) |
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return targetdir |
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def fetch_and_preprocess(directory_to_extract_to, columns_to_use = None): |
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""" |
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High level function to fetch_and_preprocess the PAMAP2 dataset |
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directory_to_extract_to: the directory where the data will be stored |
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columns_to_use: the columns to use |
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""" |
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if columns_to_use is None: |
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columns_to_use = ['hand_acc_16g_x', 'hand_acc_16g_y', 'hand_acc_16g_z', |
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'ankle_acc_16g_x', 'ankle_acc_16g_y', 'ankle_acc_16g_z', |
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'chest_acc_16g_x', 'chest_acc_16g_y', 'chest_acc_16g_z'] |
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targetdir = fetch_data(directory_to_extract_to) |
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outdatapath = targetdir + '/PAMAP2_Dataset' + '/slidingwindow512cleaned/' |
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if not os.path.exists(outdatapath): |
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os.makedirs(outdatapath) |
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if os.path.isfile(outdatapath+'X_train.npy'): |
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print('Data previously pre-processed and np-files saved to ' + outdatapath) |
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else: |
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datadir = targetdir + '/PAMAP2_Dataset/Protocol' |
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filenames = listdir(datadir) |
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print('Start pre-processing all ' + str(len(filenames)) + ' files...') |
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# load the files and put them in a list of pandas dataframes: |
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datasets = [pd.read_csv(datadir+'/'+fn, header=None, sep=' ') for fn in filenames] |
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datasets = addheader(datasets) # add headers to the datasets |
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#Interpolate dataset to get same sample rate between channels |
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datasets_filled = [d.interpolate() for d in datasets] |
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# Create mapping for class labels |
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ysetall = [set(np.array(data.activityID)) - set([0]) for data in datasets_filled] |
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classlabels = list(set.union(*[set(y) for y in ysetall])) |
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nr_classes = len(classlabels) |
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mapclasses = {classlabels[i] : i for i in range(len(classlabels))} |
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#Create input (X) and output (y) sets |
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Xall = [np.array(data[columns_to_use]) for data in datasets_filled] |
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yall = [np.array(data.activityID) for data in datasets_filled] |
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Xylists = [split_activities(y, X) for X, y in zip(Xall, yall)] |
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Xlists, ylists = zip(*Xylists) |
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ybinarylists = [transform_y(y, mapclasses, nr_classes) for y in ylists] |
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# Split in train, test and val |
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Xtrainlist, Xvallist, Xtestlist, ytrainlist, yvallist, ytestlist = split_dataset(datasets_filled, Xlists, ybinarylists) |
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# Take sliding-window frames. Target is label of last time step |
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# Data is 100 Hz |
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frame_length = int(5.12 * 100) |
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step = 1 * 100 |
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Xtrain = [] |
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ytrain = [] |
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Xval = [] |
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yval = [] |
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Xtest = [] |
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ytest = [] |
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sliding_window(frame_length, step, Xtrain, ytrain, ytrainlist, Xtrainlist) |
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sliding_window(frame_length, step, Xval, yval, yvallist, Xvallist) |
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sliding_window(frame_length, step, Xtest, ytest, ytestlist, Xtestlist) |
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numpify_and_store(Xtrain, ytrain, 'X_train', 'y_train', outdatapath, shuffle=True) |
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numpify_and_store(Xval, yval, 'X_val', 'y_val', outdatapath, shuffle=True) |
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numpify_and_store(Xtest, ytest, 'X_test', 'y_test', outdatapath, shuffle=True) |
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print('Processed data succesfully stored in ' + outdatapath) |
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return outdatapath |
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def load_data(outputpath): |
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ext = '.npy' |
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Xtrain = np.load(outputpath+'X_train'+ext) |
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ytrain_binary = np.load(outputpath+'y_train_binary'+ext) |
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Xval = np.load(outputpath+'X_val'+ext) |
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yval_binary = np.load(outputpath+'y_val_binary'+ext) |
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Xtest = np.load(outputpath+'X_test'+ext) |
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ytest_binary = np.load(outputpath+'y_test_binary'+ext) |
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return Xtrain, ytrain_binary, Xval, yval_binary, X_test, ytest_binary |
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