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syntax = "proto3";
package tensorflow;
import "tensorflow/core/framework/cost_graph.proto";
import "tensorflow/core/framework/graph.proto";
import "tensorflow/core/framework/step_stats.proto";
import "tensorflow/core/protobuf/cluster.proto";
import "tensorflow/core/protobuf/debug.proto";
import "tensorflow/core/protobuf/rewriter_config.proto";
option cc_enable_arenas = true;
option java_outer_classname = "ConfigProtos";
option java_multiple_files = true;
option java_package = "org.tensorflow.framework";
option go_package = "";
message GPUOptions {
// Fraction of the available GPU memory to allocate for each process.
// 1 means to allocate all of the GPU memory, 0.5 means the process
// allocates up to ~50% of the available GPU memory.
// GPU memory is pre-allocated unless the allow_growth option is enabled.
// If greater than 1.0, uses CUDA unified memory to potentially oversubscribe
// the amount of memory available on the GPU device by using host memory as a
// swap space. Accessing memory not available on the device will be
// significantly slower as that would require memory transfer between the host
// and the device. Options to reduce the memory requirement should be
// considered before enabling this option as this may come with a negative
// performance impact. Oversubscription using the unified memory requires
// Pascal class or newer GPUs and it is currently only supported on the Linux
// operating system. See
// for the detailed requirements.
double per_process_gpu_memory_fraction = 1;
// If true, the allocator does not pre-allocate the entire specified
// GPU memory region, instead starting small and growing as needed.
bool allow_growth = 4;
// The type of GPU allocation strategy to use.
// Allowed values:
// "": The empty string (default) uses a system-chosen default
// which may change over time.
// "BFC": A "Best-fit with coalescing" algorithm, simplified from a
// version of dlmalloc.
string allocator_type = 2;
// Delay deletion of up to this many bytes to reduce the number of
// interactions with gpu driver code. If 0, the system chooses
// a reasonable default (several MBs).
int64 deferred_deletion_bytes = 3;
// A comma-separated list of GPU ids that determines the 'visible'
// to 'virtual' mapping of GPU devices. For example, if TensorFlow
// can see 8 GPU devices in the process, and one wanted to map
// visible GPU devices 5 and 3 as "/device:GPU:0", and "/device:GPU:1",
// then one would specify this field as "5,3". This field is similar in
// spirit to the CUDA_VISIBLE_DEVICES environment variable, except
// it applies to the visible GPU devices in the process.
// NOTE:
// 1. The GPU driver provides the process with the visible GPUs
// in an order which is not guaranteed to have any correlation to
// the *physical* GPU id in the machine. This field is used for
// remapping "visible" to "virtual", which means this operates only
// after the process starts. Users are required to use vendor
// specific mechanisms (e.g., CUDA_VISIBLE_DEVICES) to control the
// physical to visible device mapping prior to invoking TensorFlow.
// 2. In the code, the ids in this list are also called "platform GPU id"s,
// and the 'virtual' ids of GPU devices (i.e. the ids in the device
// name "/device:GPU:<id>") are also called "TF GPU id"s. Please
// refer to third_party/tensorflow/core/common_runtime/gpu/gpu_id.h
// for more information.
string visible_device_list = 5;
// In the event polling loop sleep this many microseconds between
// PollEvents calls, when the queue is not empty. If value is not
// set or set to 0, gets set to a non-zero default.
int32 polling_active_delay_usecs = 6;
// This field is deprecated and ignored.
int32 polling_inactive_delay_msecs = 7;
// Force all tensors to be gpu_compatible. On a GPU-enabled TensorFlow,
// enabling this option forces all CPU tensors to be allocated with Cuda
// pinned memory. Normally, TensorFlow will infer which tensors should be
// allocated as the pinned memory. But in case where the inference is
// incomplete, this option can significantly speed up the cross-device memory
// copy performance as long as it fits the memory.
// Note that this option is not something that should be
// enabled by default for unknown or very large models, since all Cuda pinned
// memory is unpageable, having too much pinned memory might negatively impact
// the overall host system performance.
bool force_gpu_compatible = 8;
message Experimental {
// Configuration for breaking down a visible GPU into multiple "virtual"
// devices.
message VirtualDevices {
// Per "virtual" device memory limit, in MB. The number of elements in
// the list is the number of virtual devices to create on the
// corresponding visible GPU (see "virtual_devices" below).
// If empty, it will create single virtual device taking all available
// memory from the device.
// For the concept of "visible" and "virtual" GPU, see the comments for
// "visible_device_list" above for more information.
repeated float memory_limit_mb = 1;
// The multi virtual device settings. If empty (not set), it will create
// single virtual device on each visible GPU, according to the settings
// in "visible_device_list" above. Otherwise, the number of elements in the
// list must be the same as the number of visible GPUs (after
// "visible_device_list" filtering if it is set), and the string represented
// device names (e.g. /device:GPU:<id>) will refer to the virtual
// devices and have the <id> field assigned sequentially starting from 0,
// according to the order they appear in this list and the "memory_limit"
// list inside each element. For example,
// visible_device_list = "1,0"
// virtual_devices { memory_limit: 1GB memory_limit: 2GB }
// virtual_devices {}
// will create three virtual devices as:
// /device:GPU:0 -> visible GPU 1 with 1GB memory
// /device:GPU:1 -> visible GPU 1 with 2GB memory
// /device:GPU:2 -> visible GPU 0 with all available memory
// NOTE:
// 1. It's invalid to set both this and "per_process_gpu_memory_fraction"
// at the same time.
// 2. Currently this setting is per-process, not per-session. Using
// different settings in different sessions within same process will
// result in undefined behavior.
repeated VirtualDevices virtual_devices = 1;
// If true, uses CUDA unified memory for memory allocations. If
// per_process_gpu_memory_fraction option is greater than 1.0, then unified
// memory is used regardless of the value for this field. See comments for
// per_process_gpu_memory_fraction field for more details and requirements
// of the unified memory. This option is useful to oversubscribe memory if
// multiple processes are sharing a single GPU while individually using less
// than 1.0 per process memory fraction.
bool use_unified_memory = 2;
// If > 1, the number of device-to-device copy streams to create
// for each GPUDevice. Default value is 0, which is automatically
// converted to 1.
int32 num_dev_to_dev_copy_streams = 3;
// If non-empty, defines a good GPU ring order on a single worker based on
// device interconnect. This assumes that all workers have the same GPU
// topology. Specify as a comma-separated string, e.g. "3,2,1,0,7,6,5,4".
// This ring order is used by the RingReducer implementation of
// CollectiveReduce, and serves as an override to automatic ring order
// generation in OrderTaskDeviceMap() during CollectiveParam resolution.
string collective_ring_order = 4;
// If true then extra work is done by GPUDevice and GPUBFCAllocator to
// keep track of when GPU memory is freed and when kernels actually
// complete so that we can know when a nominally free memory chunk
// is really not subject to pending use.
bool timestamped_allocator = 5;
// reserved id: 6
// Parameters for GPUKernelTracker. By default no kernel tracking is done.
// Note that timestamped_allocator is only effective if some tracking is
// specified.
// If kernel_tracker_max_interval = n > 0, then a tracking event
// is inserted after every n kernels without an event.
int32 kernel_tracker_max_interval = 7;
// If kernel_tracker_max_bytes = n > 0, then a tracking event is
// inserted after every series of kernels allocating a sum of
// memory >= n. If one kernel allocates b * n bytes, then one
// event will be inserted after it, but it will count as b against
// the pending limit.
int32 kernel_tracker_max_bytes = 8;
// If kernel_tracker_max_pending > 0 then no more than this many
// tracking events can be outstanding at a time. An attempt to
// launch an additional kernel will stall until an event
// completes.
int32 kernel_tracker_max_pending = 9;
// Everything inside experimental is subject to change and is not subject
// to API stability guarantees in
Experimental experimental = 9;
// Options passed to the graph optimizer
message OptimizerOptions {
// If true, optimize the graph using common subexpression elimination.
bool do_common_subexpression_elimination = 1;
// If true, perform constant folding optimization on the graph.
bool do_constant_folding = 2;
// Constant folding optimization replaces tensors whose values can be
// predetermined, with constant nodes. To avoid inserting too large constants,
// the size of each constant created can be limited. If this value is zero, a
// default limit of 10 MiB will be applied. If constant folding optimization
// is disabled, this value is ignored.
int64 max_folded_constant_in_bytes = 6;
// If true, perform function inlining on the graph.
bool do_function_inlining = 4;
// Optimization level
enum Level {
// L1 is the default level.
// Optimization performed at L1 :
// 1. Common subexpression elimination
// 2. Constant folding
L1 = 0;
// No optimizations
L0 = -1;
// Overall optimization level. The actual optimizations applied will be the
// logical OR of the flags that this level implies and any flags already set.
Level opt_level = 3;
// Control the use of the compiler/jit. Experimental.
enum GlobalJitLevel {
DEFAULT = 0; // Default setting ("off" now, but later expected to be "on")
OFF = -1;
// The following settings turn on compilation, with higher values being
// more aggressive. Higher values may reduce opportunities for parallelism
// and may use more memory. (At present, there is no distinction, but this
// is expected to change.)
ON_1 = 1;
ON_2 = 2;
GlobalJitLevel global_jit_level = 5;
message GraphOptions {
// Removed, use optimizer_options below.
reserved "skip_common_subexpression_elimination";
reserved 1;
// If true, use control flow to schedule the activation of Recv nodes.
// (Currently ignored.)
bool enable_recv_scheduling = 2;
// Options controlling how graph is optimized.
OptimizerOptions optimizer_options = 3;
// The number of steps to run before returning a cost model detailing
// the memory usage and performance of each node of the graph. 0 means
// no cost model.
int64 build_cost_model = 4;
// The number of steps to skip before collecting statistics for the
// cost model.
int64 build_cost_model_after = 9;
// Annotate each Node with Op output shape data, to the extent it can
// be statically inferred.
bool infer_shapes = 5;
// Only place the subgraphs that are run, rather than the entire graph.
// This is useful for interactive graph building, where one might
// produce graphs that cannot be placed during the debugging
// process. In particular, it allows the client to continue work in
// a session after adding a node to a graph whose placement
// constraints are unsatisfiable.
bool place_pruned_graph = 6;
// If true, transfer float values between processes as bfloat16.
bool enable_bfloat16_sendrecv = 7;
// If > 0, record a timeline every this many steps.
// EXPERIMENTAL: This currently has no effect in MasterSession.
int32 timeline_step = 8;
// Options that control the type and amount of graph rewriting.
// Not currently configurable via the public Python API (i.e. there is no API
// stability guarantee if you import RewriterConfig explicitly).
RewriterConfig rewrite_options = 10;
message ThreadPoolOptionProto {
// The number of threads in the pool.
// 0 means the system picks a value based on where this option proto is used
// (see the declaration of the specific field for more info).
int32 num_threads = 1;
// The global name of the threadpool.
// If empty, then the threadpool is made and used according to the scope it's
// in - e.g., for a session threadpool, it is used by that session only.
// If non-empty, then:
// - a global threadpool associated with this name is looked
// up or created. This allows, for example, sharing one threadpool across
// many sessions (e.g., like the default behavior, if
// inter_op_parallelism_threads is not configured), but still partitioning
// into a large and small pool.
// - if the threadpool for this global_name already exists, then it is an
// error if the existing pool was created using a different num_threads
// value as is specified on this call.
// - threadpools created this way are never garbage collected.
string global_name = 2;
message RPCOptions {
// If true, always use RPC to contact the session target.
// If false (the default option), TensorFlow may use an optimized
// transport for client-master communication that avoids the RPC
// stack. This option is primarily for used testing the RPC stack.
bool use_rpc_for_inprocess_master = 1;
// The compression algorithm to be used. One of "deflate", "gzip".
string compression_algorithm = 2;
// If compression_algorithm is set, the compression level to be used.
// From 0 (no compression), up to 3.
int32 compression_level = 3;
// Setting cache_rpc_response to true will enable sender side caching of
// response for RecvTensorAsync and RecvBufAsync to allow receiver to retry
// requests . This is only necessary when the network fabric is experiencing a
// significant error rate. Without it we'll fail a step on an network error,
// while with it we'll be able to complete long steps (like complex
// initializations) in the face of some network errors during RecvTensor.
bool cache_rpc_response = 4;
// Disables TCP connection sharing when opening a new RPC channel.
bool disable_session_connection_sharing = 5;
// Metadata about the session.
// This can be used by the runtime and the Ops for debugging, monitoring, etc.
// The (name, version) tuple is expected to be a unique identifier for
// sessions within the same process.
// NOTE: This is currently used and propagated only by the direct session.
message SessionMetadata {
string name = 1;
// The version is optional. If set, needs to be >= 0.
int64 version = 2;
// Session configuration parameters.
// The system picks appropriate values for fields that are not set.
message ConfigProto {
// Map from device type name (e.g., "CPU" or "GPU" ) to maximum
// number of devices of that type to use. If a particular device
// type is not found in the map, the system picks an appropriate
// number.
map<string, int32> device_count = 1;
// The execution of an individual op (for some op types) can be
// parallelized on a pool of intra_op_parallelism_threads.
// 0 means the system picks an appropriate number.
// If you create an ordinary session, e.g., from Python or C++,
// then there is exactly one intra op thread pool per process.
// The first session created determines the number of threads in this pool.
// All subsequent sessions reuse/share this one global pool.
// There are notable exceptions to the default behavior describe above:
// 1. There is an environment variable for overriding this thread pool,
// 2. When connecting to a server, such as a remote `tf.train.Server`
// instance, then this option will be ignored altogether.
int32 intra_op_parallelism_threads = 2;
// Nodes that perform blocking operations are enqueued on a pool of
// inter_op_parallelism_threads available in each process.
// 0 means the system picks an appropriate number.
// Negative means all operations are performed in caller's thread.
// Note that the first Session created in the process sets the
// number of threads for all future sessions unless use_per_session_threads is
// true or session_inter_op_thread_pool is configured.
int32 inter_op_parallelism_threads = 5;
// If true, use a new set of threads for this session rather than the global
// pool of threads. Only supported by direct sessions.
// If false, use the global threads created by the first session, or the
// per-session thread pools configured by session_inter_op_thread_pool.
// This option is deprecated. The same effect can be achieved by setting
// session_inter_op_thread_pool to have one element, whose num_threads equals
// inter_op_parallelism_threads.
bool use_per_session_threads = 9;
// This option is experimental - it may be replaced with a different mechanism
// in the future.
// Configures session thread pools. If this is configured, then RunOptions for
// a Run call can select the thread pool to use.
// The intended use is for when some session invocations need to run in a
// background pool limited to a small number of threads:
// - For example, a session may be configured to have one large pool (for
// regular compute) and one small pool (for periodic, low priority work);
// using the small pool is currently the mechanism for limiting the inter-op
// parallelism of the low priority work. Note that it does not limit the
// parallelism of work spawned by a single op kernel implementation.
// - Using this setting is normally not needed in training, but may help some
// serving use cases.
// - It is also generally recommended to set the global_name field of this
// proto, to avoid creating multiple large pools. It is typically better to
// run the non-low-priority work, even across sessions, in a single large
// pool.
repeated ThreadPoolOptionProto session_inter_op_thread_pool = 12;
// Assignment of Nodes to Devices is recomputed every placement_period
// steps until the system warms up (at which point the recomputation
// typically slows down automatically).
int32 placement_period = 3;
// When any filters are present sessions will ignore all devices which do not
// match the filters. Each filter can be partially specified, e.g. "/job:ps"
// "/job:worker/replica:3", etc.
repeated string device_filters = 4;
// Options that apply to all GPUs.
GPUOptions gpu_options = 6;
// Whether soft placement is allowed. If allow_soft_placement is true,
// an op will be placed on CPU if
// 1. there's no GPU implementation for the OP
// or
// 2. no GPU devices are known or registered
// or
// 3. need to co-locate with reftype input(s) which are from CPU.
bool allow_soft_placement = 7;
// Whether device placements should be logged.
bool log_device_placement = 8;
// Options that apply to all graphs.
GraphOptions graph_options = 10;
// Global timeout for all blocking operations in this session. If non-zero,
// and not overridden on a per-operation basis, this value will be used as the
// deadline for all blocking operations.
int64 operation_timeout_in_ms = 11;
// Options that apply when this session uses the distributed runtime.
RPCOptions rpc_options = 13;
// Optional list of all workers to use in this session.
ClusterDef cluster_def = 14;
// If true, any resources such as Variables used in the session will not be
// shared with other sessions. However, when clusterspec propagation is
// enabled, this field is ignored and sessions are always isolated.
bool isolate_session_state = 15;
// When true, WorkerSessions are created with device attributes from the
// full cluster.
// This is helpful when a worker wants to partition a graph
// (for example during a PartitionedCallOp).
bool share_cluster_devices_in_session = 17;
// Everything inside Experimental is subject to change and is not subject
// to API stability guarantees in
message Experimental {
// Task name for group resolution.
string collective_group_leader = 1;
// We removed the flag client_handles_error_formatting. Marking the tag
// number as reserved.
// TODO(shikharagarwal): Should we just remove this tag so that it can be
// used in future for other purpose?
reserved 2;
// Which executor to use, the default executor will be used
// if it is an empty string or "DEFAULT"
string executor_type = 3;
// Guidance to formatting of large RecvBuf fields for transfer.
// Any positive value sets the max chunk size. 0 defaults to 4096.
// Any negative value indicates no max, i.e. one chunk only.
int32 recv_buf_max_chunk = 4;
// If true, and supported by the platform, the runtime will attempt to
// use NUMA affinity where applicable. One consequence will be the
// existence of as many CPU devices as there are available NUMA nodes.
bool use_numa_affinity = 5;
// If true, make collective op execution order sequential and deterministic
// for potentially concurrent collective instances.
bool collective_deterministic_sequential_execution = 6;
// If true, use NCCL for CollectiveOps. This feature is highly
// experimental.
bool collective_nccl = 7;
// In the following, session state means the value of a variable, elements
// in a hash table, or any other resource, accessible by worker sessions
// held by a TF server.
// When ClusterSpec propagation is enabled, the value of
// isolate_session_state is ignored when deciding whether to share session
// states in a TF server (for backwards compatibility reasons).
// - If share_session_state_in_clusterspec_propagation is true, the session
// states are shared.
// - If share_session_state_in_clusterspec_propagation is false, session
// states are isolated.
// When clusterspec propagation is not used, the value of
// share_session_state_in_clusterspec_propagation is ignored when deciding
// whether to share session states in a TF server.
// - If isolate_session_state is true, session states are isolated.
// - If isolate_session_state is false, session states are shared.
// TODO(b/129330037): Add a single API that consistently treats
// isolate_session_state and ClusterSpec propagation.
bool share_session_state_in_clusterspec_propagation = 8;
// If using a direct session, disable spinning while waiting for work in
// the thread pool. This may result in higher latency for completing ops,
// but in the case where there is a lot of spinning may result in lower
// CPU usage.
bool disable_thread_spinning = 9;
// This was promoted to a non-experimental API. Please use
// ConfigProto.share_cluster_devices_in_session instead.
bool share_cluster_devices_in_session = 10;
// Metadata about the session.
// If set, this can be used by the runtime and the Ops for debugging,
// monitoring, etc.
// NOTE: This is currently used and propagated only by the direct session.
SessionMetadata session_metadata = 11;
// If true, the session may treat the graph as being static for optimization
// purposes.
// If this option is set to true when a session is created, the full
// GraphDef must be passed in a single call to Session::Create(), and
// Session::Extend() may not be supported.
bool optimize_for_static_graph = 12;
// Whether to enable the MLIR-based TF->XLA bridge.
// This is a replacement to the existing bridge, and not ready for
// production usage yet.
// If this option is set to true when a session is created, MLIR is used to
// perform the set of graph transformations to put the graph in a form that
// can be executed with delegation of some computations to an accelerator.
// This builds on the model of XLA where a subset of the graph is
// encapsulated and attached to a "compile" operation, whose result is fed
// to an "execute" operation. The kernel for these operations is responsible
// to lower the encapsulated graph to a particular device.
bool enable_mlir_bridge = 13;
// Whether to enable the MLIR-based Graph optimizations.
// This will become a part of standard Tensorflow graph optimization
// pipeline, currently this is only used for gradual migration and testing
// new passes that are replacing existing optimizations in Grappler.
bool enable_mlir_graph_optimization = 16;
// If true, the session will not store an additional copy of the graph for
// each subgraph.
// If this option is set to true when a session is created, the
// `RunOptions.output_partition_graphs` options must not be set.
bool disable_output_partition_graphs = 14;
// Minimum number of batches run through the XLA graph before XLA fusion
// autotuner is enabled. Default value of zero disables the autotuner.
// The XLA fusion autotuner can improve performance by executing a heuristic
// search on the compiler parameters.
int64 xla_fusion_autotuner_thresh = 15;
Experimental experimental = 16;
// Next: 18
// Options for a single Run() call.
message RunOptions {
// TODO(pbar) Turn this into a TraceOptions proto which allows
// tracing to be controlled in a more orthogonal manner?
enum TraceLevel {
TraceLevel trace_level = 1;
// Time to wait for operation to complete in milliseconds.
int64 timeout_in_ms = 2;
// The thread pool to use, if session_inter_op_thread_pool is configured.
// To use the caller thread set this to -1 - this uses the caller thread
// to execute Session::Run() and thus avoids a context switch. Using the
// caller thread to execute Session::Run() should be done ONLY for simple
// graphs, where the overhead of an additional context switch is
// comparable with the overhead of Session::Run().
int32 inter_op_thread_pool = 3;
// Whether the partition graph(s) executed by the executor(s) should be
// outputted via RunMetadata.
bool output_partition_graphs = 5;
// EXPERIMENTAL. Options used to initialize DebuggerState, if enabled.
DebugOptions debug_options = 6;
// When enabled, causes tensor allocation information to be included in
// the error message when the Run() call fails because the allocator ran
// out of memory (OOM).
// Enabling this option can slow down the Run() call.
bool report_tensor_allocations_upon_oom = 7;
// Everything inside Experimental is subject to change and is not subject
// to API stability guarantees in
message Experimental {
// If non-zero, declares that this graph is going to use collective
// ops and must synchronize step_ids with any other graph with this
// same group_key value (in a distributed computation where tasks
// run disjoint graphs).
int64 collective_graph_key = 1;
// If true, then operations (using the inter-op pool) across all
// session::run() calls will be centrally scheduled, optimizing for (median
// and tail) latency.
// Consider using this option for CPU-bound workloads like inference.
bool use_run_handler_pool = 2;
// Options for run handler thread pool.
message RunHandlerPoolOptions {
// Priority of the request. The run handler thread pool will schedule ops
// based on the priority number. The larger number means higher priority.
int64 priority = 1;
RunHandlerPoolOptions run_handler_pool_options = 3;
Experimental experimental = 8;
reserved 4;
// Metadata output (i.e., non-Tensor) for a single Run() call.
message RunMetadata {
// Statistics traced for this step. Populated if tracing is turned on via the
// "RunOptions" proto.
// EXPERIMENTAL: The format and set of events may change in future versions.
StepStats step_stats = 1;
// The cost graph for the computation defined by the run call.
CostGraphDef cost_graph = 2;
// Graphs of the partitions executed by executors.
repeated GraphDef partition_graphs = 3;
message FunctionGraphs {
// TODO(nareshmodi): Include some sort of function/cache-key identifier?
repeated GraphDef partition_graphs = 1;
GraphDef pre_optimization_graph = 2;
GraphDef post_optimization_graph = 3;
// This is only populated for graphs that are run as functions in TensorFlow
// V2. There will be an entry below for each function that is traced.
// The main use cases of the post_optimization_graph and the partition_graphs
// is to give the caller insight into the graphs that were actually run by the
// runtime. Additional information (such as those in step_stats) will match
// these graphs.
// We also include the pre_optimization_graph since it is usually easier to
// read, and is helpful in situations where the caller wants to get a high
// level idea of what the built graph looks like (since the various graph
// optimization passes might change the structure of the graph significantly).
repeated FunctionGraphs function_graphs = 4;
// Defines a connection between two tensors in a `GraphDef`.
message TensorConnection {
// A tensor name. The value of this tensor will be substituted for
// the tensor named in `to_tensor`.
string from_tensor = 1;
// A tensor name. The value of this tensor will be bound to the
// value of the tensor named in `from_tensor`.
string to_tensor = 2;
// Defines a subgraph in another `GraphDef` as a set of feed points and nodes
// to be fetched or executed.
// Compare with the arguments to `Session::Run()`.
message CallableOptions {
// Tensors to be fed in the callable. Each feed is the name of a tensor.
repeated string feed = 1;
// Fetches. A list of tensor names. The caller of the callable expects a
// tensor to be returned for each fetch[i] (see RunStepResponse.tensor). The
// order of specified fetches does not change the execution order.
repeated string fetch = 2;
// Target Nodes. A list of node names. The named nodes will be run by the
// callable but their outputs will not be returned.
repeated string target = 3;
// Options that will be applied to each run.
RunOptions run_options = 4;
// Tensors to be connected in the callable. Each TensorConnection denotes
// a pair of tensors in the graph, between which an edge will be created
// in the callable.
repeated TensorConnection tensor_connection = 5;
// The Tensor objects fed in the callable and fetched from the callable
// are expected to be backed by host (CPU) memory by default.
// The options below allow changing that - feeding tensors backed by
// device memory, or returning tensors that are backed by device memory.
// The maps below map the name of a feed/fetch tensor (which appears in
// 'feed' or 'fetch' fields above), to the fully qualified name of the device
// owning the memory backing the contents of the tensor.
// For example, creating a callable with the following options:
// CallableOptions {
// feed: "a:0"
// feed: "b:0"
// fetch: "x:0"
// fetch: "y:0"
// feed_devices: {
// "a:0": "/job:localhost/replica:0/task:0/device:GPU:0"
// }
// fetch_devices: {
// "y:0": "/job:localhost/replica:0/task:0/device:GPU:0"
// }
// }
// means that the Callable expects:
// - The first argument ("a:0") is a Tensor backed by GPU memory.
// - The second argument ("b:0") is a Tensor backed by host memory.
// and of its return values:
// - The first output ("x:0") will be backed by host memory.
// - The second output ("y:0") will be backed by GPU memory.
// It is the responsibility of the caller to ensure that the memory of the fed
// tensors will be correctly initialized and synchronized before it is
// accessed by operations executed during the call to Session::RunCallable().
// This is typically ensured by using the TensorFlow memory allocators
// (Device::GetAllocator()) to create the Tensor to be fed.
// Alternatively, for CUDA-enabled GPU devices, this typically means that the
// operation that produced the contents of the tensor has completed, i.e., the
// CUDA stream has been synchronized (e.g., via cuCtxSynchronize() or
// cuStreamSynchronize()).
map<string, string> feed_devices = 6;
map<string, string> fetch_devices = 7;
// By default, RunCallable() will synchronize the GPU stream before returning
// fetched tensors on a GPU device, to ensure that the values in those tensors
// have been produced. This simplifies interacting with the tensors, but
// potentially incurs a performance hit.
// If this options is set to true, the caller is responsible for ensuring
// that the values in the fetched tensors have been produced before they are
// used. The caller can do this by invoking `Device::Sync()` on the underlying
// device(s), or by feeding the tensors back to the same Session using
// `feed_devices` with the same corresponding device name.
bool fetch_skip_sync = 8;
// Next: 9
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