private Tuple <List <string>, List <string>, List <string> > InitParams(
Dictionary <string, Shape> inputShapes,
bool overwrite = false)
{
List <uint[]> argShapes = new List <uint[]>();
List <uint[]> auxShapes = new List <uint[]>();
this._symbol.InferShape(inputShapes, argShapes, null, auxShapes);
var argNames = this._symbol.ListArguments();
var inputNames = inputShapes.Keys;
var paramNames = argNames.Except(inputNames);
var auxNames = this._symbol.ListAuxiliaryStates();
var paramNameShapes = argNames.Zip(argShapes, Tuple.Create).Where(w => paramNames.Contains(w.Item1));
var argParams = paramNameShapes.ToDictionary(k => k.Item1, s => NdArray.Zeros(new Shape(s.Item2)));
var auxParams = auxNames.Zip(auxShapes, Tuple.Create).ToDictionary(k => k.Item1, s => NdArray.Zeros(new Shape(s.Item2)));
foreach (var kv in argParams)
{
var k = kv.Key;
if (this.ArgParams != null && this.ArgParams.ContainsKey(kv.Key) && !overwrite)
{
this.ArgParams[k].CopyTo(argParams[k]);
}
else
{
this._initializer.Call(k, argParams[k]);
}
}
foreach (var kv in auxParams)
{
var k = kv.Key;
if (this.AuxParams != null && this.AuxParams.ContainsKey(kv.Key) && !overwrite)
{
this.AuxParams[k].CopyTo(auxParams[k]);
}
else
{
this._initializer.Call(k, argParams[k]);
}
}
this.ArgParams = argParams;
this.AuxParams = auxParams;
return(Tuple.Create(argNames.ToList(), paramNames.ToList(), auxNames.ToList()));
}
private Executor BindExec(Symbol sym, Context ctx, Dictionary <string, uint[]> inputShapes,
IList <string> paramNames, bool needGradInput, Executor baseExec,
Dictionary <string, NdArray> sharedDataArrays, Dictionary <string, Type> inputTypes = null, ILog logger = null)
{
if (logger == null)
{
logger = LogManager.GetLogger("");
}
var argShapes = new List <uint[]>();
var auxShapes = new List <uint[]>();
var outShapes = new List <uint[]>();
sym.InferShape(inputShapes, argShapes, outShapes, auxShapes);
var argTypes = new List <Type>();
var auxType = new List <Type>();
var outType = new List <Type>();
if (inputTypes == null)
{
inputTypes = inputShapes.ToDictionary(k => k.Key, v => typeof(float));
}
sym.InferType(inputTypes, argTypes, auxType, outType);
var gradArrays = needGradInput ? new Dictionary <string, NdArray>() : null;
var argNames = sym.ListArguments();
HashSet <string> needGrad;
if (needGradInput == false)
{
needGrad = new HashSet <string>();
}
else
{
needGrad = new HashSet <string>(argNames.Except(inputShapes.Keys));
}
var gradReq = argNames.ToDictionary(name => name, v => needGrad.Contains(v) ? OpReqType.KWriteTo : OpReqType.KNullOp);
List <NdArray> argArrays = new List <NdArray>();
//create or borrow arguments and gradients
for (int i = 0; i < argNames.Count; i++)
{
var name = argNames[i];
if (!paramNames.Contains(name))
{
NdArray argArr;
//data or label
if (sharedDataArrays != null && sharedDataArrays.ContainsKey(name))
{
argArr = sharedDataArrays[name];
if (Util.Prod(argArr.GetShape()) >= Util.Prod(argShapes[i]))
{
Util.Assert(argTypes[i] == argArr.GetDtype());
argArr = argArr.Reshape(new Shape(argShapes[i]));
}
else
{
logger.Warn($"bucketing: data \"{name}\" has a shape {new Shape(argShapes[i])}" +
", which is larger than already allocated " +
$"shape {argArr.GetShape()}" +
". Need to re-allocate. Consider putting " +
"default_bucket_key to be the bucket taking the largest " +
"input for better memory sharing.");
argArr = NdArray.Zeros(new Shape(argShapes[i]), ctx, dtype: argTypes[i]);
// replace existing shared array because the new one is bigger
sharedDataArrays[name] = argArr;
}
}
else
{
argArr = NdArray.Zeros(new Shape(argShapes[i]), ctx, dtype: argTypes[i]);
if (sharedDataArrays != null)
{
sharedDataArrays[name] = argArr;
}
}
argArrays.Add(argArr);
}
else
{
NdArray argArr;
if (baseExec == null)
{
argArr = NdArray.Zeros(new Shape(argShapes[i]), ctx, dtype: argTypes[i]);
if (needGradInput && needGrad.Contains(name))
{
var gradArr = NdArray.Zeros(new Shape(argShapes[i]), ctx, dtype: argTypes[i]);
gradArrays[name] = gradArr;
}
}
else
{
argArr = baseExec.ArgDict[name];
Util.Assert(argArr.GetShape() == new Shape(argShapes[i]));
Util.Assert(argArr.GetDtype() == argTypes[i]);
if (needGradInput && needGrad.Contains(name))
{
gradArrays[name] = baseExec.GradDict[name];
}
}
argArrays.Add(argArr);
}
}
IList <NdArray> auxArrays;
if (baseExec == null)
{
auxArrays = auxShapes.Zip(auxType, (l, r) => NdArray.Zeros(new Shape(l), ctx, r)).ToList();
}
else
{
for (int i = 0; i < baseExec.AuxArrays.Count; i++)
{
var a = baseExec.AuxArrays[i];
Util.Assert((new Shape(auxShapes[i])) == a.GetShape());
Util.Assert(auxType[i] == a.GetDtype());
}
auxArrays = baseExec.AuxArrays;
}
var executor = sym.Bind(ctx, argArrays, gradArrays,
gradReq, auxArrays, null, baseExec);
return(executor);
}
public Executor SimpleBind(
Context context,
Dictionary <string, uint[]> inputShapes,
OpReqType gradReq,
Dictionary <string, Type> typeDict = null,
Dictionary <string, Context> group2Ctx = null
)
{
var listArguments = ListArguments();
if (typeDict == null)
{
typeDict = listArguments.ToDictionary(k => k, v => typeof(float));
}
var argShapes = new List <uint[]>();
var auxShapes = new List <uint[]>();
var outShapes = new List <uint[]>();
InferShape(inputShapes, argShapes, outShapes, auxShapes);
var argTypes = new List <Type>();
var auxTypes = new List <Type>();
var outTypes = new List <Type>();
InferType(typeDict, argTypes, auxTypes, outTypes);
if (argShapes.Count == 0 || argTypes.Count == 0)
{
throw new Exception("Input node is not complete");
}
List <Context> argCtx;
List <Context> auxCtx;
if (group2Ctx != null)
{
var listattr = ListAttr(true);
var attrDict = listattr.Where(w => w.Key.EndsWith("ctx_group"))
.ToDictionary(k => k.Key, v => group2Ctx.GetValueOrDefault(v.Value, context));
argCtx = listArguments
.Select(name => attrDict.GetValueOrDefault(name + "_ctx_group", context)).ToList();
auxCtx = ListAuxiliaryStates()
.Select(name => attrDict.GetValueOrDefault(name + "_ctx_group", context)).ToList();
}
else
{
argCtx = Enumerable.Range(0, argShapes.Count).Select(s => context).ToList();
auxCtx = Enumerable.Range(0, auxShapes.Count).Select(s => context).ToList();
}
//alloc space
var argNdarrays = argTypes
.Zip(argCtx, argShapes,
(dtype, dev, shape) =>
NdArray.Zeros(new Shape(shape), dev, dtype))
.ToList();
Dictionary <string, NdArray> gradNdarrays = new Dictionary <string, NdArray>();
if (gradReq != OpReqType.KNullOp)
{
for (int i = 0; i < listArguments.Count; i++)
{
var name = listArguments[i];
var shape = argShapes[i];
var dev = argCtx[i];
var dtype = argTypes[i];
gradNdarrays[name] = NdArray.Zeros(new Shape(shape), dev, dtype: dtype);
}
}
var auxNdarrays = auxTypes
.Zip(auxCtx, auxShapes,
(dtype, dev, shape) =>
NdArray.Zeros(new Shape(shape), dev, dtype))
.ToList();
var executor = Bind(context,
argNdarrays,
gradNdarrays,
gradReq,
auxNdarrays,
groupToCtx: group2Ctx);
return(executor);
}