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[Cherry pick to 2.2.1]Fix rnn grad bug in cpu when dropout is zero (#37080) #37086

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Nov 10, 2021
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[Cherry pick to 2.2.1]Fix rnn grad bug in cpu when dropout is zero (#37080) #37086

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3 changes: 3 additions & 0 deletions paddle/fluid/operators/rnn_op.h
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Original file line number Diff line number Diff line change
Expand Up @@ -965,6 +965,9 @@ class RNNCPUKernel : public framework::OpKernel<T> {
}
dropout_mask->mutable_data<uint8_t>(output->dims(), ctx.GetPlace());

auto& dev_ctx = ctx.template device_context<platform::CPUDeviceContext>();
math::SetConstant<platform::CPUDeviceContext, uint8_t> ones;
ones(dev_ctx, dropout_mask, static_cast<uint8_t>(1));
// init the output and allocate the memory
output->mutable_data<T>(ctx.GetPlace());
int gate_num = 4;
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30 changes: 30 additions & 0 deletions python/paddle/fluid/tests/unittests/test_rnn_op.py
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Expand Up @@ -168,5 +168,35 @@ def set_attrs(self):
self.is_bidirec = True


class TestRNNOp5(TestRNNOp):
def set_attrs(self):
self.num_layers = 2


class TestRNNOp6(TestRNNOp):
def set_attrs(self):
self.num_layers = 2
self.is_bidirec = True


class TestRNNOp7(TestRNNOp):
def set_attrs(self):
self.num_layers = 2
self.is_bidirec = True
self.is_test = True


class TestRNNOp8(TestRNNOp):
def set_attrs(self):
self.num_layers = 2
self.is_bidirec = True
self.sequence_length = None


class TestRNNOp9(TestRNNOp):
def set_attrs(self):
self.num_layers = 3


if __name__ == '__main__':
unittest.main()