public virtual SvmNode[] GetSvmNode(ItemRating rating)
{
var svmNode = new SvmNode[2] {
new SvmNode(Mapper.ToInternalID(rating.User.Id), 1),
new SvmNode(Mapper.ToInternalID(rating.Item.Id + rating.Domain.Id), 1)
};
return(svmNode);
}
public override string GetLibFmFeatureVector(ItemRating rating)
{
string baseVector = base.GetLibFmFeatureVector(rating);
string conns = rating.User.GetProperty("Connections");
if (string.IsNullOrEmpty(conns))
return baseVector;
string extension = UseConnectionStrength ? GetImplicitConnectionsVector(conns) : GetExplicitConnectionsVector(conns);
return baseVector + " " + extension;
}
public override string GetLibFmFeatureVector(ItemRating rating)
{
string baseVector = base.GetLibFmFeatureVector(rating);
string conns = rating.User.GetProperty("Connections");
if (string.IsNullOrEmpty(conns))
{
return(baseVector);
}
string extension = UseConnectionStrength ? GetImplicitConnectionsVector(conns) : GetExplicitConnectionsVector(conns);
return(baseVector + " " + extension);
}
public override string GetLibFmFeatureVector(ItemRating rating)
{
// format:
// rating uid:1 iid: 1 ai1: 0.5 ai2: 0.3 bi1: 0.1 bi2: 0.7
string baseFeatVector = base.GetLibFmFeatureVector(rating);
string userExtendedVector = "";
if (!_userCrossDomainFeatureVector.TryGetValue(rating.User.Id, out userExtendedVector))
{
userExtendedVector = BuildUserCrossDomainFeatureVector(rating.User);
_userCrossDomainFeatureVector.Add(rating.User.Id, userExtendedVector);
}
return(baseFeatVector + userExtendedVector);
}
public override string GetLibFmFeatureVector(ItemRating rating)
{
// format:
// rating uid:1 iid: 1 ai1: 0.5 ai2: 0.3 bi1: 0.1 bi2: 0.7
string baseFeatVector = base.GetLibFmFeatureVector(rating);
string userExtendedVector = "";
if (!_userCrossDomainFeatureVector.TryGetValue(rating.User.Id, out userExtendedVector))
{
userExtendedVector = BuildUserCrossDomainFeatureVector(rating.User);
_userCrossDomainFeatureVector.Add(rating.User.Id, userExtendedVector);
}
return baseFeatVector + userExtendedVector;
}
public override LibSvm.SvmNode[] GetSvmNode(ItemRating rating)
{
int followersCount = _container.Tweets[rating].FollowersCount;
double followersFeature = followersCount > 1000 ? 1.0 : (double)followersCount / 1000;
int friendsCount = _container.Tweets[rating].FriendsCount;
double friendsFeature = friendsCount > 1000 ? 1.0 : (double)friendsCount / 1000;
var svmNode = new SvmNode[6] {
//new SvmNode(Mapper.ToInternalID("RetweetCount"), _container.Tweets[rating].RetweetCount),
new SvmNode(Mapper.ToInternalID("Rating"), rating.Rating),
new SvmNode(Mapper.ToInternalID("FollowersCount"), followersFeature),
new SvmNode(Mapper.ToInternalID("FriendsCount"), friendsFeature),
new SvmNode(Mapper.ToInternalID(rating.User.Id), 1),
new SvmNode(Mapper.ToInternalID(rating.Item.Id + rating.Domain.Id), 1),
new SvmNode(Mapper.ToInternalID(_container.Tweets[rating].MovieUrl), 1),
};
return svmNode;
}
public virtual string GetLibFmFeatureVector(ItemRating rating)
{
return(string.Format("{0} {1}:1 {2}:1", rating.Rating, Mapper.ToInternalID(rating.User.Id), Mapper.ToInternalID(rating.Item.Id)));
}
public ItemRating CreateItemRating(string relationId, double? timestamp, string properties, string linkedEntities)
{
var ir = new ItemRating();
ir.Id = relationId;
ir.Timestamp = timestamp;
var jProperties = JObject.Parse(properties);
// add general properties
jProperties.Properties().ToList().ForEach(p => ir.AddProperty(p.Name, p.Value.ToString()));
// try to extract rating from properties
try
{
ir.Rating = float.Parse(jProperties["rating"].ToString());
}
catch (Exception)
{
throw new Exception("Can not find / parse rating in the relation.");
}
// parse linked entities
var jLinkedEntities = JObject.Parse(linkedEntities);
// user
string user = jLinkedEntities["subject"].ToString();
if (!user.Contains("user"))
throw new Exception("Expect subject of type user in the linked entities.");
string userId = user.Substring(user.IndexOf(':') + 1);
User u;
if (!Users.TryGetValue(userId, out u))
{
Console.WriteLine(string.Format("User with id {0} is not defined in the entities file.", userId));
u = new User(userId);
}
u.Ratings.Add(ir);
// item
string item = jLinkedEntities["object"].ToString();
if (!item.Contains("movie") && !item.Contains("item"))
throw new Exception("Expect object of type movie or item in the linked entities.");
string itemId = item.Substring(item.IndexOf(':') + 1);
Item i;
if (!Items.TryGetValue(itemId, out i))
{
Console.WriteLine(string.Format("Item with id {0} is not defined in the entities file.", itemId));
i = new Item(itemId);
}
i.Ratings.Add(ir);
ir.User = u;
ir.Item = i;
return ir;
}
public virtual string GetLibFmFeatureVector(ItemRating rating)
{
return string.Format("{0} {1}:1 {2}:1", rating.Rating, Mapper.ToInternalID(rating.User.Id), Mapper.ToInternalID(rating.Item.Id));
}
