[Diffusion] Add C++ dpm solver (#714)

* Add BetaForAlphaBar, ConvertModelOutput, SetTimesteps, and constructor for DPMSolverMultistepScheduler

* tmp

* Add DPMSolverFirstOrderUpdate

* Add ScaleModelInput

* Add MultiStepDPMSolverSecondOrderUpdate

* add MultiStepDPMSolverThirdOrderUpdate

* Add Step

* Add FASTDEPLOY_DECL

* Add AddNoise

* Fix operator

* update

* Fix DPMSolverMultistepScheduler

* Upgrade Slice

* Fix DPMSolverFirstOrderUpdate

* remove FASTDEPLOY_DECL

* Add config for dpm solver

examples/multimodal/stable_diffusion/cpp/scheduler.h

@@ -0,0 +1,31 @@
+// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include "fastdeploy/core/fd_tensor.h"
+
+namespace fastdeploy {
+
+class Scheduler {
+  virtual void SetTimesteps(int num_inference_steps) = 0;
+  virtual void Step(const FDTensor& model_output, int timestep,
+                    const FDTensor& sample, FDTensor* prev_sample) = 0;
+  virtual void ScaleModelInput(const FDTensor& sample, FDTensor* out,
+                               const std::vector<FDTensor>& timesteps = {}) = 0;
+  virtual void AddNoise(const FDTensor& original_samples, const FDTensor& noise,
+                        const FDTensor& timesteps, FDTensor* out) = 0;
+};
+
+}  // namespace fastdeploy