public void SaveTextStream(string name, Action <TextWriter> action)
{
_ectx.Check(InRepository, "Can't save a text stream when writing to a single stream");
_ectx.CheckNonEmpty(name, nameof(name));
_ectx.CheckValue(action, nameof(action));
// I verified in the CLR source that the default buffer size is 1024. It's unfortunate
// that to set leaveOpen to true, we have to specify the buffer size....
using (var ent = Repository.CreateEntry(Directory, name))
using (var writer = Utils.OpenWriter(ent.Stream))
{
action(writer);
}
}
/// <summary>
/// Save schema associations of role/column-name in <paramref name="rep"/>.
/// </summary>
internal static void SaveRoleMappings(IHostEnvironment env, IChannel ch, RoleMappedSchema schema, RepositoryWriter rep)
{
// REVIEW: Should we also save this stuff, for instance, in some portion of the
// score command or transform?
Contracts.AssertValue(env);
env.AssertValue(ch);
ch.AssertValue(schema);
ArrayDataViewBuilder builder = new ArrayDataViewBuilder(env);
List<string> rolesList = new List<string>();
List<string> columnNamesList = new List<string>();
// OrderBy is stable, so there is no danger in it "reordering" columns
// when a role is filled by multiple columns.
foreach (var role in schema.GetColumnRoleNames().OrderBy(r => r.Key.Value))
{
rolesList.Add(role.Key.Value);
columnNamesList.Add(role.Value);
}
builder.AddColumn("Role", rolesList.ToArray());
builder.AddColumn("Column", columnNamesList.ToArray());
using (var entry = rep.CreateEntry(DirTrainingInfo, RoleMappingFile))
{
// REVIEW: It seems very important that we have the role mappings
// be easily human interpretable and even manipulable, but relying on the
// text saver/loader means that special characters like '\n' won't be reinterpretable.
// On the other hand, no one is such a big lunatic that they will actually
// ever go ahead and do something so stupid as that.
var saver = new TextSaver(env, new TextSaver.Arguments() { Dense = true, Silent = true });
var view = builder.GetDataView();
saver.SaveData(entry.Stream, view, Utils.GetIdentityPermutation(view.Schema.ColumnCount));
}
}
/// <summary>
/// Create a ModelSaveContext supporting saving to a repository, for implementors of ICanSaveModel.
/// </summary>
public ModelSaveContext(RepositoryWriter rep, string dir, string name)
{
Contracts.CheckValue(rep, nameof(rep));
Repository = rep;
_ectx = rep.ExceptionContext;
_ectx.CheckValueOrNull(dir);
_ectx.CheckNonEmpty(name, nameof(name));
Directory = dir;
Strings = new NormStr.Pool();
_ent = rep.CreateEntry(dir, name);
try
{
Writer = new BinaryWriter(_ent.Stream, Encoding.UTF8, leaveOpen: true);
try
{
ModelHeader.BeginWrite(Writer, out FpMin, out Header);
}
catch
{
Writer.Dispose();
throw;
}
}
catch
{
_ent.Dispose();
throw;
}
}
/// <summary>
/// Save the object by calling TrySaveModel then falling back to .net serialization.
/// </summary>
public static void SaveModel <T>(RepositoryWriter rep, T value, string path)
where T : class
{
if (value == null)
{
return;
}
var sm = value as ICanSaveModel;
if (sm != null)
{
using (var ctx = new ModelSaveContext(rep, path, ModelLoadContext.ModelStreamName))
{
sm.Save(ctx);
ctx.Done();
}
return;
}
var sb = value as ICanSaveInBinaryFormat;
if (sb != null)
{
using (var ent = rep.CreateEntry(path, ModelLoadContext.NameBinary))
using (var writer = new BinaryWriter(ent.Stream, Encoding.UTF8, leaveOpen: true))
{
sb.SaveAsBinary(writer);
}
return;
}
}
public static RepositoryWriter CreateNew(Stream stream, IExceptionContext ectx = null, bool useFileSystem = true)
{
Contracts.CheckValueOrNull(ectx);
ectx.CheckValue(stream, nameof(stream));
var rep = new RepositoryWriter(stream, ectx, useFileSystem);
using (var ent = rep.CreateEntry(ModelFileUtils.DirTrainingInfo, "Version.txt"))
using (var writer = Utils.OpenWriter(ent.Stream))
writer.WriteLine(typeof(RepositoryWriter).Assembly.GetName().Version);
return(rep);
}
