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提交 263e0197 编写于 作者: C chengduoZH
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上级 09570b48
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Showing with 133 addition and 64 deletion
paddle/operators/layer_norm_op.cc
浏览文件 @ 263e0197
......@@ -33,29 +33,35 @@ class LayerNormOp : public framework::OperatorWithKernel {
using framework::OperatorWithKernel::OperatorWithKernel;
void InferShape(framework::InferShapeContext *ctx) const override {
PADDLE_ENFORCE(ctx->HasInput("X"), "");
PADDLE_ENFORCE(ctx->HasInput("Scale"), "");
PADDLE_ENFORCE(ctx->HasInput("Bias"), "");
PADDLE_ENFORCE(ctx->HasOutput("Y"), "");
PADDLE_ENFORCE(ctx->HasInput("X"),
"Input(X) of LayerNormOp should not be null.");
PADDLE_ENFORCE(ctx->HasOutput("Y"),
"Output(Y) of LayerNormOp should not be null.");
PADDLE_ENFORCE(ctx->HasOutput("Mean"),
"Output(Mean) of LayerNormOp should not be null.");
PADDLE_ENFORCE(ctx->HasOutput("Variance"),
"Output(Variance) of LayerNormOp should not be null.");
auto x_dim = ctx->GetInputDim("X");
auto begin_norm_axis = ctx->Attrs().Get<int>("begin_norm_axis");
PADDLE_ENFORCE_LT(begin_norm_axis, x_dim.size(),
"'begin_norm_axis' must be less than the rank of X");
"'begin_norm_axis' must be less than the rank of X.");
auto matrix_dim = framework::flatten_to_2d(x_dim, begin_norm_axis);
int left = static_cast<int>(matrix_dim[0]);
int right = static_cast<int>(matrix_dim[1]);
if (ctx->HasInput("Scale")) {
PADDLE_ENFORCE_EQ(ctx->GetInputDim("Scale").size(), 1UL);
PADDLE_ENFORCE_EQ(ctx->GetInputDim("Scale")[0], right);
}
if (ctx->HasInput("Bias")) {
PADDLE_ENFORCE_EQ(ctx->GetInputDim("Bias").size(), 1UL);
PADDLE_ENFORCE_EQ(ctx->GetInputDim("Bias")[0], right);
}
ctx->SetOutputDim("Y", ctx->GetInputDim("X"));
ctx->SetOutputDim("Mean", {left});
ctx->SetOutputDim("Variance", {left});
ctx->ShareLoD("X", "Y");
}
};
......@@ -64,18 +70,26 @@ class LayerNormOpMaker : public framework::OpProtoAndCheckerMaker {
public:
LayerNormOpMaker(OpProto *proto, OpAttrChecker *op_checker)
: OpProtoAndCheckerMaker(proto, op_checker) {
AddInput("X", "The input tensor");
AddInput("X", "(LoDTensor) The input tensor.");
AddInput("Scale",
"Scale is a 1-dimensional tensor of size H "
"that is applied to the output");
"(Tensor, optional) Scale is a 1-dimensional tensor of size "
"H(`begin_norm_axis` splits the tensor(`X`) to a matrix [N,H])."
"It is applied to the output.")
.AsDispensable();
AddInput("Bias",
"Bias is a 1-dimensional tensor of size H "
"that is applied to the output");
AddOutput("Y", "result after normalization");
AddOutput("Mean", "Mean of the current mini batch.");
AddOutput("Variance", "Variance of the current mini batch.");
AddAttr<float>("epsilon", "")
"(Tensor, optional) Bias is a 1-dimensional tensor of size "
"H(`begin_norm_axis` splits the tensor(`X`) to a matrix [N,H])."
"It is applied to the output.")
.AsDispensable();
AddOutput("Y", "(LoDTensor) Result after normalization.");
AddOutput("Mean", "(Tensor) Mean of the current mini batch.")
.AsIntermediate();
AddOutput("Variance", "(Tensor) Variance of the current mini batch.")
.AsIntermediate();
AddAttr<float>("epsilon",
"(float, default 1e-5) Constant for "
"numerical stability")
.SetDefault(1e-5)
.AddCustomChecker([](const float &epsilon) {
PADDLE_ENFORCE(epsilon >= 0.0f && epsilon <= 0.001f,
......@@ -83,7 +97,9 @@ class LayerNormOpMaker : public framework::OpProtoAndCheckerMaker {
});
AddAttr<int>("begin_norm_axis",
"(int default:1), the "
"axis of `begin_norm_axis ... Rank(X) - 1` will be normalized")
"axis of `begin_norm_axis ... Rank(X) - 1` will be "
"normalized. `begin_norm_axis` splits the tensor(`X`) to a "
"matrix [N,H].")
.SetDefault(1)
.AddCustomChecker([](const int &begin_norm_axis) {
PADDLE_ENFORCE_GT(begin_norm_axis, 0,
......@@ -124,8 +140,7 @@ class LayerNormKernel<platform::CPUDeviceContext, T>
int right = static_cast<int>(matrix_dim[1]);
auto input_map = ConstEigenMatrixMapRowMajor<T>(x->data<T>(), left, right);
auto scale_map = ConstEigenMatrixMapRowMajor<T>(scale->data<T>(), 1, right);
auto bias_map = ConstEigenMatrixMapRowMajor<T>(bias->data<T>(), 1, right);
auto mean_map = EigenMatrixMapRowMajor<T>(mean->data<T>(), left, 1);
auto var_map = EigenMatrixMapRowMajor<T>(var->data<T>(), left, 1);
auto output_map = EigenMatrixMapRowMajor<T>(output->data<T>(), left, right);
......@@ -141,14 +156,32 @@ class LayerNormKernel<platform::CPUDeviceContext, T>
.unaryExpr(add_epslion);
auto inv_std_func = [](T ele) { return std::sqrt(1 / ele); };
// TODO(zcd): Some thinking about output_map, is it appropriate that
// `output_map` and `input_map` point to the same memory.
auto inv_std = var_map.unaryExpr(inv_std_func);
if (scale && bias) {
auto scale_map =
ConstEigenMatrixMapRowMajor<T>(scale->data<T>(), 1, right);
auto bias_map = ConstEigenMatrixMapRowMajor<T>(bias->data<T>(), 1, right);
output_map = (input_map - mean_map.replicate(1, right))
.cwiseProduct(inv_std.replicate(1, right))
.cwiseProduct(scale_map.replicate(left, 1)) +
bias_map.replicate(left, 1);
} else if (scale) {
auto scale_map =
ConstEigenMatrixMapRowMajor<T>(scale->data<T>(), 1, right);
output_map = (input_map - mean_map.replicate(1, right))
.cwiseProduct(inv_std.replicate(1, right))
.cwiseProduct(scale_map.replicate(left, 1));
} else if (bias) {
auto bias_map = ConstEigenMatrixMapRowMajor<T>(bias->data<T>(), 1, right);
output_map = (input_map - mean_map.replicate(1, right))
.cwiseProduct(inv_std.replicate(1, right)) +
bias_map.replicate(left, 1);
} else {
output_map = (input_map - mean_map.replicate(1, right))
.cwiseProduct(inv_std.replicate(1, right));
}
}
};
......@@ -158,11 +191,16 @@ class LayerNormGradOp : public framework::OperatorWithKernel {
void InferShape(framework::InferShapeContext *ctx) const override {
// check input
PADDLE_ENFORCE(ctx->HasInput("X"));
PADDLE_ENFORCE(ctx->HasInput("Scale"), "");
PADDLE_ENFORCE(ctx->HasInput("Mean"), "");
PADDLE_ENFORCE(ctx->HasInput("Variance"), "");
PADDLE_ENFORCE(ctx->HasInput(framework::GradVarName("Y")), "");
PADDLE_ENFORCE(ctx->HasInput("X"),
"Input(X) of LayerNormOp should not be null.");
PADDLE_ENFORCE(ctx->HasInput("Scale"),
"Input(Scale) of LayerNormOp should not be null.");
PADDLE_ENFORCE(ctx->HasInput("Mean"),
"Input(Mean) of LayerNormOp should not be null.");
PADDLE_ENFORCE(ctx->HasInput("Variance"),
"Input(Variance) of LayerNormOp should not be null.");
PADDLE_ENFORCE(ctx->HasInput(framework::GradVarName("Y")),
"Input(Y@GRAD) of LayerNormOp should not be null.");
// check output
if (ctx->HasOutput(framework::GradVarName("X"))) {
......@@ -222,7 +260,6 @@ class LayerNormGradKernel<platform::CPUDeviceContext, T>
auto *d_scale = ctx.Output<Tensor>(framework::GradVarName("Scale"));
auto *d_bias = ctx.Output<Tensor>(framework::GradVarName("Bias"));
auto scale_map = ConstEigenMatrixMapRowMajor<T>(scale->data<T>(), 1, right);
auto x_map = ConstEigenMatrixMapRowMajor<T>(x->data<T>(), left, right);
auto d_y_map = ConstEigenMatrixMapRowMajor<T>(d_y->data<T>(), left, right);
auto mean_map = ConstEigenMatrixMapRowMajor<T>(mean->data<T>(), left, 1);
......@@ -254,6 +291,10 @@ class LayerNormGradKernel<platform::CPUDeviceContext, T>
auto d_x_map = EigenMatrixMapRowMajor<T>(d_x->data<T>(), left, right);
auto triple_product_func = [](T ele) { return ele * ele * ele; };
auto inv_std_func = [](T ele) { return std::sqrt(1 / ele); };
// TODO(zcd): these code can be refined
if (d_scale) {
auto scale_map =
ConstEigenMatrixMapRowMajor<T>(scale->data<T>(), 1, right);
// dy_dx
auto dx_end = var_map.unaryExpr(inv_std_func)
.replicate(1, right)
......@@ -283,6 +324,34 @@ class LayerNormGradKernel<platform::CPUDeviceContext, T>
(x_map - mean_map.replicate(1, right)).cwiseProduct(dvar_end);
d_x_map = dx_end + dx_mean + dx_var;
} else {
// dy_dx
auto dx_end = var_map.unaryExpr(inv_std_func)
.replicate(1, right)
.cwiseProduct(d_y_map);
// dy_dmean_dx
auto dx_mean = (T(-1.0) / right) *
var_map.unaryExpr(inv_std_func)
.replicate(1, right)
.cwiseProduct(d_y_map)
.rowwise()
.sum()
.replicate(1, right);
// dy_var_dx
auto dvar_end_part = (x_map - mean_map.replicate(1, right))
.cwiseProduct(d_y_map)
.rowwise()
.sum();
auto dvar_end = var_map.unaryExpr(inv_std_func)
.unaryExpr(triple_product_func)
.cwiseProduct(dvar_end_part)
.replicate(1, right);
auto dx_var =
(T(-1.0) / right) *
(x_map - mean_map.replicate(1, right)).cwiseProduct(dvar_end);
d_x_map = dx_end + dx_mean + dx_var;
}
}
}
};
......
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