Hi,

I tried to optimize a model with network of inception i3d by TFTRT 4.0.1.6.

Below is the log, and I consider it to be a TRT issue.

```
2018-09-07 16:45:16.422304: I tensorflow/core/grappler/devices.cc:51] Number of eligible GPUs (core count >= 8): 1
2018-09-07 16:45:16.423845: I tensorflow/core/platform/cpu_feature_guard.cc:140] Your CPU supports instructions that this TensorFlow binary was not compiled to use: AVX2 FMA
2018-09-07 16:45:16.756320: I tensorflow/contrib/tensorrt/convert/convert_graph.cc:383] MULTIPLE tensorrt candidate conversion: 31
2018-09-07 16:45:17.187103: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:0 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Conv3d_2c_3x3/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.189426: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:1 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_3b/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.191707: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:2 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_3b/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.193955: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:3 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_3c/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.196193: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:4 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_3c/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.198473: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:5 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4b/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.200760: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:6 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4b/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.203015: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:7 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_3b/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.205279: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:8 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4b/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.207518: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:9 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Conv3d_2b_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.209783: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:10 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4c/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.212047: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:11 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4f/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.214285: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:12 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4f/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.216531: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:13 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4c/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.218798: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:14 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Logits/Conv3d_0c_1x1/conv_3d/convolution" SKIPPING......( 2 nodes)
2018-09-07 16:45:17.221132: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:15 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_5c/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.223399: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:16 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4e/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.226049: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:17 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_3c/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.228287: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:18 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4d/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.230523: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:19 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_5b/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.232786: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:20 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4d/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.235023: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:21 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_5c/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.237322: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:22 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_5b/Branch_3/Conv3d_0b_1x1/conv_3d/convolution" SKIPPING......( 22 nodes)
2018-09-07 16:45:17.239577: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:23 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Conv3d_1a_7x7/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.241903: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:24 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4f/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.244137: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:25 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_5b/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.246736: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:26 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4d/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.248969: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:27 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_5c/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.251202: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:28 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4e/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.253432: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:29 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4e/Branch_1/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:17.255669: W tensorflow/contrib/tensorrt/convert/convert_graph.cc:412] subgraph conversion error for subgraph_index:30 due to: "Unimplemented: Require 4 dimensional input. Got 5 RGB/inception_i3d/Mixed_4c/Branch_2/Conv3d_0a_1x1/conv_3d/convolution" SKIPPING......( 5 nodes)
2018-09-07 16:45:19.401136: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1344] Found device 0 with properties:
name: TITAN Xp major: 6 minor: 1 memoryClockRate(GHz): 1.582
pciBusID: 0000:84:00.0
totalMemory: 11.91GiB freeMemory: 9.70GiB
2018-09-07 16:45:19.401211: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1423] Adding visible gpu devices: 0
2018-09-07 16:45:19.401238: I tensorflow/core/common_runtime/gpu/gpu_device.cc:911] Device interconnect StreamExecutor with strength 1 edge matrix:
2018-09-07 16:45:19.401249: I tensorflow/core/common_runtime/gpu/gpu_device.cc:917] 0
2018-09-07 16:45:19.401258: I tensorflow/core/common_runtime/gpu/gpu_device.cc:930] 0: N
2018-09-07 16:45:19.401488: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1041] Created TensorFlow device (/job:localhost/replica:0/task:0/device:GPU:0 with 9756 MB memory) -> physical GPU (device: 0, name: TITAN Xp, pci bus id: 0000:84:00.0, compute capability: 6.1)
Converted 0 variables to const ops.
```

Finally 0 variables are converted, so the optimization is actually failed.

Any idea will be welcome.

Thanks,

oscarriddle