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- refs/heads/wilrich/cntkv2Cython
- refs/heads/wilrich/cntkv2Swig
- refs/heads/wilrich/rl
- refs/heads/wolfma/checkdep
- refs/heads/wolfma/instsplat
- refs/heads/wolfma/mkl2017
- refs/heads/wolfma/setup
- refs/heads/wolfma/t-makrei/transpose-fix
- refs/heads/xiaoyongzhu-master
- refs/heads/xwang/tts-lace
- refs/heads/yacheo/h-softmax
- refs/heads/yacheo/h-softmax-fix
- refs/heads/yanchen/copy-api-internals
- refs/heads/yanchen/custom-attrs
- refs/heads/yanchen/custom-attrs-future
- refs/heads/yanchen/custom-attrs-loadbuf
- refs/heads/yanchen/custom-op-desc
- refs/heads/yanchen/future-attrs
- refs/heads/yanchen/load-from-mem
- refs/heads/yanchen/load-from-memory
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- refs/heads/yanchen/onnx-description
- refs/heads/yanchen/output-mapping
- refs/heads/yanchen/primitive-func
- refs/heads/yanchen/rm-asserts
- refs/heads/yanchen/wchar
- refs/heads/yaronwe/hide-protobuf
- refs/heads/yingsh/OrderedCEWithSM
- refs/heads/yuqing/HDF5Reader
- refs/heads/yuqtang/AugmentMinibatchSourceAPI
- refs/heads/yuqtang/ChangeOneHotDefaultToSparse
- refs/heads/yuqtang/DebugCrossTalkConv2d
- refs/heads/yuqtang/DebugGPUMemory
- refs/heads/yuqtang/DyanmicChunkDescriptions
- refs/heads/yuqtang/EnableDefMBSizeInStreamInfo
- refs/heads/yuqtang/FixBugsInNoBackPropOpsGradients
- refs/heads/yuqtang/FixDistributedTrainingCounts
- 3af9845d0b2f43209fcdfc088f1685866c436aaf
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Removing x86 builds
//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.md file in the project root for full license information.
//
#define _CRT_SECURE_NO_WARNINGS // "secure" CRT not available on all platforms --add this at the top of all CPP files that give "function or variable may be unsafe" warnings
#include "Basics.h"
#include "ComputationNode.h"
#include "ComputationNetwork.h"
#include "RecurrentNodes.h"
#include <string>
#include <set>
using namespace std;
namespace Microsoft { namespace MSR { namespace CNTK {
// -----------------------------------------------------------------------
// network recurrent-loop analysis
// -----------------------------------------------------------------------
// Helper functions
static int DetermineLoopDirection(const std::vector<ComputationNodeBasePtr>& nestedNodes);
static int GetRecurrenceSteppingDirection(const ComputationNodeBasePtr& node);
//
// The method below determine evaluation order, which is tricky in the presence of recurrent loops.
// It is the main entry for network recurrent-loop analysis.
// This function analysis the networks for recurrent loops present in the computation graph.
// It sets/updates:
// - m_allSEQNodes
// - ComputationNode::m_isPartOfLoop (exposed to outside as IsPartOfLoop())
// - the cached m_evalOrders[root], reordered to make nodes belonging to the same loop consecutive. TODO: Try not to do that.
// It is often called before ValidateNetwork() on the roots and is called from inside ValidateNetwork() as well.
// Note: This function does not cache anything. BuildAndValidateSubNetwork() caches, but others don't.
//
void ComputationNetwork::FormRecurrentLoops()
{
ExecutionGraph graph(m_allRoots);
auto strongComponents = StrongComponents(graph);
// In order not to change the existing behavior/naming for BrainScript,
// let's remember the 'source' node of each strong component.
std::vector<ComputationNodeBasePtr> componentRootNodes;
componentRootNodes.reserve(strongComponents.size());
for (const auto& c : strongComponents)
componentRootNodes.push_back(c.Nodes().back());
// Sort nodes inside the strong components in the evaluation order.
std::function<bool(const ComputationNodeBasePtr&)> delay
= [this](const ComputationNodeBasePtr& n) { return GetRecurrenceSteppingDirection(n) != 0; };
EvaluationSort(graph, delay, strongComponents);
// Update m_allSEQNodes accordingly.
for (size_t i = 0; i < strongComponents.size(); ++i)
{
const auto& c = strongComponents[i];
SEQTraversalFlowControlNode flowControlNode(i, componentRootNodes[i]);
flowControlNode.m_nestedNodes = c.Nodes(); // TODO: make these two part of the constructor
for (auto node : flowControlNode.m_nestedNodes)
node->m_isPartOfLoop = true; // this is the only flag in ComputationNode that escapes FormRecurrentLoops()!
flowControlNode.m_steppingDirection = DetermineLoopDirection(flowControlNode.m_nestedNodes);
m_allSEQNodes.push_back(make_shared<SEQTraversalFlowControlNode>(std::move(flowControlNode)));
}
// Peform global sort on all nodes honoring inner strong component sorting.
auto sortedNodes = GlobalEvaluationSort(graph, strongComponents);
// Update global eval order in m_evalOrder.
// TODO: Get rid of this after-the-fact patch.
UpdateEvalOrder(nullptr, std::list<ComputationNodeBasePtr>(sortedNodes.begin(), sortedNodes.end()));
// log the loops
if (TraceLevel() > 0)
{
for (auto& iter : m_allSEQNodes)
{
fprintf(stderr, "\nLoop[%d] --> %ls -> %d nodes\n", (int)iter->m_loopId, iter->NodeName().c_str(), (int)iter->m_nestedNodes.size());
size_t n = 0;
for (auto itr = iter->m_nestedNodes.begin(); itr != iter->m_nestedNodes.end(); itr++)
{
if (n++ % 3 == 0)
fprintf(stderr, "\n");
fprintf(stderr, "\t%ls", (*itr)->NodeName().c_str());
}
fprintf(stderr, "\n");
}
}
}
// checks whether a node is recurrent, and which direction
static int GetRecurrenceSteppingDirection(const ComputationNodeBasePtr& node)
{
if (node->Is<IRecurrentNode>())
return node->As<IRecurrentNode>()->GetRecurrenceSteppingDirection();
else
return 0;
}
// set m_steppingDirection for all loops
// TODO: Move this up to where it is used (in a separate commit since git cannot track moving and changing at the same time).
// BUGBUG: Need to extend to multi-dimensional loop directions. Use a vector<int>.
static int DetermineLoopDirection(const std::vector<ComputationNodeBasePtr>& nestedNodes)
{
int steppingDirection = 0;
for (auto& node : nestedNodes)
{
int dir = GetRecurrenceSteppingDirection(node);
if (dir == 0) // not a recurrent node
continue;
if (steppingDirection == 0)
steppingDirection = dir;
else if (steppingDirection != dir)
InvalidArgument("It is not allowed to have multiple different stepping directions in the same loop (loop connected to %ls %ls operation).",
nestedNodes.front()->NodeName().c_str(), nestedNodes.front()->OperationName().c_str());
}
if (steppingDirection == 0)
LogicError("There is no recurrent node in the loop connected to %ls %ls operation.",
nestedNodes.front()->NodeName().c_str(), nestedNodes.front()->OperationName().c_str());
// BUGBUG: Multiple recurrence dimensions not yet supported beyond this point.
return steppingDirection;
}
}}}
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