/// <summary>Read in rating data from a file</summary>
/// <param name="filename">the name of the file to read from</param>
/// <param name="user_mapping">mapping object for user IDs</param>
/// <param name="item_mapping">mapping object for item IDs</param>
/// <param name="test_rating_format">whether there is a rating column in each line or not</param>
/// <param name="ignore_first_line">if true, ignore the first line</param>
/// <returns>the rating data</returns>
static public ITimedRatings Read(
string filename,
IMapping user_mapping = null, IMapping item_mapping = null,
TestRatingFileFormat test_rating_format = TestRatingFileFormat.WITH_RATINGS,
bool ignore_first_line = false)
{
string binary_filename = filename + ".bin.TimedRatings";
if (FileSerializer.Should(user_mapping, item_mapping) && File.Exists(binary_filename))
{
return((ITimedRatings)FileSerializer.Deserialize(binary_filename));
}
return(Wrap.FormatException <ITimedRatings>(filename, delegate() {
using (var reader = new StreamReader(filename))
{
var ratings = (TimedRatings)Read(reader, user_mapping, item_mapping);
if (FileSerializer.Should(user_mapping, item_mapping) && FileSerializer.CanWrite(binary_filename))
{
ratings.Serialize(binary_filename);
}
return ratings;
}
}));
}
/// <summary>Read in implicit feedback data from a file</summary>
/// <param name="filename">name of the file to be read from</param>
/// <param name="user_mapping">user <see cref="IMapping"/> object</param>
/// <param name="item_mapping">item <see cref="IMapping"/> object</param>
/// <param name="ignore_first_line">if true, ignore the first line</param>
/// <returns>a <see cref="IPosOnlyFeedback"/> object with the user-wise collaborative data</returns>
static public IPosOnlyFeedback Read(string filename, IMapping user_mapping = null, IMapping item_mapping = null, bool ignore_first_line = false)
{
string binary_filename = filename + ".bin.PosOnlyFeedback";
if (FileSerializer.Should(user_mapping, item_mapping) && File.Exists(binary_filename))
{
return((IPosOnlyFeedback)FileSerializer.Deserialize(binary_filename));
}
return(Wrap.FormatException <IPosOnlyFeedback>(filename, delegate() {
using (var reader = new StreamReader(filename))
{
var feedback_data = (ISerializable)Read(reader, user_mapping, item_mapping);
if (FileSerializer.Should(user_mapping, item_mapping) && FileSerializer.CanWrite(binary_filename))
{
feedback_data.Serialize(binary_filename);
}
return (IPosOnlyFeedback)feedback_data;
}
}));
}
/// <summary>Read in rating data which will be interpreted as implicit feedback data from a file</summary>
/// <param name="filename">name of the file to be read from</param>
/// <param name="rating_threshold">the minimum rating value needed to be accepted as positive feedback</param>
/// <param name="user_mapping">user <see cref="IMapping"/> object</param>
/// <param name="item_mapping">item <see cref="IMapping"/> object</param>
/// <param name="ignore_first_line">if true, ignore the first line</param>
/// <returns>a <see cref="IPosOnlyFeedback"/> object with the user-wise collaborative data</returns>
static public IPosOnlyFeedback Read(string filename, float rating_threshold, IMapping user_mapping = null, IMapping item_mapping = null, bool ignore_first_line = false)
{
string binary_filename = string.Format(CultureInfo.InvariantCulture, "{0}.bin.PosOnlyFeedbackThreshold-{1}", filename, rating_threshold);
if (FileSerializer.Should(user_mapping, item_mapping) && File.Exists(binary_filename))
{
return((IPosOnlyFeedback)FileSerializer.Deserialize(binary_filename));
}
return(Wrap.FormatException <IPosOnlyFeedback>(filename, delegate() {
using (var reader = new StreamReader(filename))
{
var feedback_data = (ISerializable)Read(reader, rating_threshold, user_mapping, item_mapping);
if (FileSerializer.Should(user_mapping, item_mapping) && FileSerializer.CanWrite(binary_filename))
{
feedback_data.Serialize(binary_filename);
}
return (IPosOnlyFeedback)feedback_data;
}
}));
}
/// <summary>Read in static rating data from a file</summary>
/// <param name="filename">the name of the file to read from</param>
/// <param name="user_mapping">mapping object for user IDs</param>
/// <param name="item_mapping">mapping object for item IDs</param>
/// <param name="rating_type">the data type to be used for storing the ratings</param>
/// <param name="test_rating_format">whether there is a rating column in each line or not</param>
/// <param name="ignore_first_line">if true, ignore the first line</param>
/// <returns>the rating data</returns>
static public IRatings Read(
string filename,
IMapping user_mapping = null, IMapping item_mapping = null,
RatingType rating_type = RatingType.FLOAT,
TestRatingFileFormat test_rating_format = TestRatingFileFormat.WITH_RATINGS,
bool ignore_first_line = false)
{
string binary_filename = filename + ".bin.StaticRatings";
if (FileSerializer.Should(user_mapping, item_mapping) && File.Exists(binary_filename))
{
return((IRatings)FileSerializer.Deserialize(binary_filename));
}
int size = 0;
using (var reader = new StreamReader(filename))
while (reader.ReadLine() != null)
{
size++;
}
if (ignore_first_line)
{
size--;
}
return(Wrap.FormatException <IRatings>(filename, delegate() {
using (var reader = new StreamReader(filename))
{
var ratings = (StaticRatings)Read(reader, size, user_mapping, item_mapping, rating_type, test_rating_format);
if (FileSerializer.Should(user_mapping, item_mapping) && FileSerializer.CanWrite(binary_filename))
{
ratings.Serialize(binary_filename);
}
return ratings;
}
}));
}