public void GetUserData(IManosContext ctx)
{
var ratings = MyRecommender.Instance.Data;
var user_mapping = MyRecommender.Instance.UserMapping;
var item_mapping = MyRecommender.Instance.ItemMapping;
int user_id = ctx.GetUserID("users");
if (user_id < 0 || user_id > ratings.MaxUserID)
{
ctx.Response.StatusCode = 404; // TODO maybe different error code
ctx.Response.End();
return;
}
var match = new Regex(@"users/\d+/(\w+)").Match(ctx.Request.Path);
string command = match.Success ? match.Groups[1].Value : string.Empty;
switch(command)
{
case "statistics":
ctx.Response.WriteLine("uid={0} num_ratings={1}", user_mapping.ToOriginalID(user_id), ratings.ByUser[user_id].Count);
break;
case "events":
var items_string = ctx.Request.QueryData.GetString("items");
if (items_string == null)
{
foreach (int index in ratings.ByUser[user_id])
ctx.Response.WriteLine("eid={0} iid={1} value={2}", index, item_mapping.ToOriginalID(ratings.Items[index]), ratings[index].ToString(CultureInfo.InvariantCulture));
}
else
{
var requested_items = new HashSet<int>(from i in items_string.Split(',') select item_mapping.ToInternalID(int.Parse(i)));
foreach (int index in ratings.ByUser[user_id])
{
int item_id = ratings.Items[index];
if (requested_items.Contains(item_id))
ctx.Response.WriteLine("eid={0} iid={1} value={2}", index, item_mapping.ToOriginalID(item_id), ratings[index].ToString(CultureInfo.InvariantCulture));
}
}
break;
case "events/ratings": // TODO support timestamps
goto case "events";
case "":
ctx.Response.WriteLine("no user metadata available");
break;
default:
ctx.Response.StatusCode = 404; // TODO maybe different error
break;
}
ctx.Response.End();
}
public void Predict(IManosContext ctx)
{
var recommender = MyRecommender.Instance.Predictor;
var ratings = MyRecommender.Instance.Data;
var item_mapping = MyRecommender.Instance.ItemMapping;
int user_id = ctx.GetUserID("users", "predictions");
if (user_id < 0 || user_id > recommender.MaxUserID)
{
ctx.Response.StatusCode = 404; // TODO maybe different error
ctx.Response.End();
return;
}
var query_data = ctx.Request.QueryData;
// TODO do this in a more elegant way
var items_string = query_data.GetString("items");
var requested_items = items_string != null
? from i in items_string.Split(',') select item_mapping.ToInternalID(int.Parse(i))
: Enumerable.Range(0, ratings.MaxItemID + 1);
// TODO do this in a more elegant way
var override_value = query_data.GetString("useStoredRatings");
bool show_stored_ratings = override_value != null ? override_value.Equals("true", StringComparison.InvariantCultureIgnoreCase) : false;
// TODO sort results
if (show_stored_ratings)
{
var known_items = new HashSet<int>(
from index in ratings.ByUser[user_id]
select ratings.Items[index]);
foreach (int item_id in requested_items)
if (known_items.Contains(item_id))
ctx.Response.WriteLine("iid={0} value={1}", item_mapping.ToOriginalID(item_id), ratings[user_id, item_id]);
else
ctx.Response.WriteLine("iid={0} value={1}", item_mapping.ToOriginalID(item_id), recommender.Predict(user_id, item_id).ToString(CultureInfo.InvariantCulture));
}
else
foreach (int item_id in requested_items)
ctx.Response.WriteLine("iid={0} value={1}", item_mapping.ToOriginalID(item_id), recommender.Predict(user_id, item_id).ToString(CultureInfo.InvariantCulture));
ctx.Response.End();
}