pandas - How can I change my index vector into sparse feature vector that can be used in sklearn? -


i doing news recommendation system , need build table users , news read. raw data :

001436800277225 [12,456,157] 009092130698762 [248] 010003000431538 [361,521,83] 010156461231357 [173,67,244] 010216216021063 [203,97] 010720006581483 [86] 011199797794333 [142,12,86,411,201] 011337201765123 [123,41] 011414545455156 [62,45,621,435] 011425002581540 [341,214,286]

the first column userid, second column newsid.newsid index column, example, after transformation, [12,456,157] in first row means user has read 12th, 456th , 157th news (in sparse vector, 12th column, 456th column , 157th column 1, while other columns have value 0). , want change these data sparse vector format can used input vector in kmeans or dbscan algorithm of sklearn. how can that?

one option construct sparse matrix explicitly. find easier build matrix in coo matrix format , cast csr format.

from scipy.sparse import coo_matrix  input_data = [     ("001436800277225", [12,456,157]),     ("009092130698762", [248]),     ("010003000431538", [361,521,83]),     ("010156461231357", [173,67,244])     ]  number_movies = 1000 # maximum index of movies in data number_users = len(input_data) # number of users in model  # you'll want have way lookup index given user id. user_row_map = {} user_row_index = 0  # structures coo format i,j,data = [],[],[] user, movies in input_data:      if user not in user_row_map:         user_row_map[user] = user_row_index         user_row_index+=1      movie in movies:         i.append(user_row_map[user])         j.append(movie)         data.append(1)  # number of times users watched movie  # create matrix in coo format; cast csr easier use feature_matrix = coo_matrix((data, (i,j)), shape=(number_users, number_movies)).tocsr()

Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more