Introducing TensortRT Operator to TF which can run (sub)graphs in

highly optimized TensorRT engines.  This commit is a merged version of
many commits by

   benbarsdell    <bbarsdell at nvidia.com>
   deadeyegoodwin <davidg at nvidia.com
   jjsjann123     <jiej at nvidia.com>
   samikama      <skama at  nvidia.com>

5 files changed, 348 insertions, 0 deletions

diff --git a/third_party/tensorrt/BUILD b/third_party/tensorrt/BUILD
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/third_party/tensorrt/BUILD
diff --git a/third_party/tensorrt/BUILD.tpl b/third_party/tensorrt/BUILD.tpl
new file mode 100644
index 0000000000..8962751f56
--- /dev/null
+++ b/third_party/tensorrt/BUILD.tpl
@@ -0,0 +1,42 @@
+# -*- python -*-
+# Description:
+#   provide tensorrt information
+
+#TODO(Sami) these needs to be defined 
+
+licenses(["notice"])  
+
+exports_files(["LICENSE"])
+
+load("@local_config_cuda//cuda:build_defs.bzl", "cuda_default_copts", "if_cuda")
+
+config_setting(
+    name = "trt_enabled",
+    define_values = {
+        "using_tensorrt":"true"
+    },
+    visibility = ["//visibility:public"],
+)
+
+cc_library(
+    name = "tensorrt",
+    srcs =[%{tensorrt_lib}],
+    hdrs = ["include/NvInfer.h",
+            "include/NvUtils.h",
+    ],
+    copts= cuda_default_copts(),
+    deps =["@local_config_cuda//cuda:cuda",
+	   "@local_config_cuda//cuda:cudnn",],
+    linkstatic = 1,
+    #include_prefix="include/",
+    includes=["include/"],
+    visibility = ["//visibility:public"],	
+)
+
+%{tensorrt_genrules}
+
+# filegroup(
+#     name = "%{tensorrt_lib}",
+#     srcs =  ["%{tensorrt_lib}"],
+#     visibility = ["//visibility:public"],
+# )
diff --git a/third_party/tensorrt/LICENSE b/third_party/tensorrt/LICENSE
new file mode 100644
index 0000000000..d3da228420
--- /dev/null
+++ b/third_party/tensorrt/LICENSE
@@ -0,0 +1,203 @@
+Copyright 2015 The TensorFlow Authors.  All rights reserved.
+
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+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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diff --git a/third_party/tensorrt/build_defs.bzl b/third_party/tensorrt/build_defs.bzl
new file mode 100644
index 0000000000..392c5e0621
--- /dev/null
+++ b/third_party/tensorrt/build_defs.bzl
@@ -0,0 +1,85 @@
+# -*- python -*-
+"""
+ add a repo_generator rule for tensorrt
+
+"""
+
+_TENSORRT_INSTALLATION_PATH="TENSORRT_INSTALL_PATH"
+_TF_TENSORRT_VERSION="TF_TENSORRT_VERSION"
+
+def _is_trt_enabled(repo_ctx):
+    if "TF_NEED_TENSORRT" in repo_ctx.os.environ:
+        enable_trt = repo_ctx.os.environ["TF_NEED_TENSORRT"].strip()
+        return enable_trt == "1"
+    return False
+
+def _dummy_repo(repo_ctx):
+
+    repo_ctx.template("BUILD",Label("//third_party/tensorrt:BUILD.tpl"),
+                      {"%{tensorrt_lib}":"","%{tensorrt_genrules}":""},
+                      False)
+    repo_ctx.template("build_defs.bzl",Label("//third_party/tensorrt:build_defs.bzl.tpl"),
+                      {"%{trt_configured}":"False"},False)
+    repo_ctx.file("include/NvUtils.h","",False)
+    repo_ctx.file("include/NvInfer.h","",False)
+
+def _trt_repo_impl(repo_ctx):
+    """
+    Implements local_config_tensorrt
+    """
+
+    if not _is_trt_enabled(repo_ctx):
+        _dummy_repo(repo_ctx)
+        return
+    trt_libdir=repo_ctx.os.environ[_TENSORRT_INSTALLATION_PATH]
+    trt_ver=repo_ctx.os.environ[_TF_TENSORRT_VERSION]
+# if deb installation
+# once a standardized installation between tar and deb
+# is done, we don't need this
+    if trt_libdir == '/usr/lib/x86_64-linux-gnu':
+        incPath='/usr/include/x86_64-linux-gnu'
+        incname='/usr/include/x86_64-linux-gnu/NvInfer.h'
+    else:
+        incPath=str(repo_ctx.path("%s/../include"%trt_libdir).realpath)
+        incname=incPath+'/NvInfer.h'
+    if len(trt_ver)>0:
+        origLib="%s/libnvinfer.so.%s"%(trt_libdir,trt_ver)
+    else:
+        origLib="%s/libnvinfer.so"%trt_libdir        
+    objdump=repo_ctx.which("objdump")
+    if objdump == None:
+        if len(trt_ver)>0:
+            targetlib="lib/libnvinfer.so.%s"%(trt_ver[0])
+        else:
+            targetlib="lib/libnvinfer.so"
+    else:
+        soname=repo_ctx.execute([objdump,"-p",origLib])
+        for l in soname.stdout.splitlines():
+            if "SONAME" in l:
+                lib=l.strip().split(" ")[-1]
+                targetlib="lib/%s"%(lib)
+    
+    if len(trt_ver)>0:
+        repo_ctx.symlink(origLib,targetlib)
+    else:
+        repo_ctx.symlink(origLib,targetlib)
+    grule=('genrule(\n    name = "trtlinks",\n'+
+           '    outs = [\n    "%s",\n    "include/NvInfer.h",\n    "include/NvUtils.h",\n     ],\n'%targetlib +
+           '    cmd="""ln -sf %s $(@D)/%s '%(origLib,targetlib) +
+           '&&\n    ln -sf %s $(@D)/include/NvInfer.h '%(incname) +
+           '&&\n    ln -sf %s/NvUtils.h $(@D)/include/NvUtils.h""",\n)\n'%(incPath))
+    repo_ctx.template("BUILD",Label("//third_party/tensorrt:BUILD.tpl"),
+                      {"%{tensorrt_lib}":'"%s"'%targetlib,"%{tensorrt_genrules}":grule},
+                      False)
+    repo_ctx.template("build_defs.bzl",Label("//third_party/tensorrt:build_defs.bzl.tpl"),
+                      {"%{trt_configured}":"True"},False)
+
+trt_repository=repository_rule(
+    implementation= _trt_repo_impl,
+    local=True,
+    environ=[
+        "TF_NEED_TENSORRT",
+        _TF_TENSORRT_VERSION,
+        _TENSORRT_INSTALLATION_PATH,
+        ],
+    )
diff --git a/third_party/tensorrt/build_defs.bzl.tpl b/third_party/tensorrt/build_defs.bzl.tpl
new file mode 100644
index 0000000000..18f354ee5a
--- /dev/null
+++ b/third_party/tensorrt/build_defs.bzl.tpl
@@ -0,0 +1,18 @@
+# -*- python -*-
+"""
+template file for trt functions
+
+"""
+
+def is_trt_enabled():
+    return %{trt_configured}
+
+def if_trt(if_true,if_false=[]):
+    # if is_trt_enabled():
+    #     return if_true
+    # return if_false
+
+    return select({
+        "@local_config_tensorrt//:trt_enabled":if_true,
+        "//conditions:default":if_false,
+    })