I was trying to optimize a TFLite graph using
`autotvm.task_extract_from_program` but the method returns an empty list. To be
precise:
```
tasks = autotvm.task.extract_from_program(mod["main"], target=target,
params=params, ops=target_op)
```
I have tried removing `ops=target_op` so that the method defaults to *all*
operators but still I get an empty task list. The output of that command
indicates that the graph is being traversed, I won't bother you with the entire
output, but here is a small sample:
```
INFO:compile_engine:Use implementation injective.cpu for op nn.bias_add
INFO:compile_engine:Use implementation injective.cpu for op clip
WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.
INFO:compile_engine:Use implementation conv2d_nhwc.x86 for op nn.conv2d
INFO:compile_engine:Use implementation injective.cpu for op nn.bias_add
WARNING:strategy:depthwise_conv2d NHWC layout is not optimized for x86.
INFO:compile_engine:Use implementation depthwise_conv2d_nhwc.generic for op
nn.conv2d
INFO:compile_engine:Use implementation injective.cpu for op nn.bias_add
INFO:compile_engine:Use implementation injective.cpu for op clip
WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.
INFO:compile_engine:Use implementation conv2d_nhwc.x86 for op nn.conv2d
INFO:compile_engine:Use implementation injective.cpu for op nn.bias_add
INFO:compile_engine:Use implementation injective.cpu for op clip
WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.
INFO:compile_engine:Use implementation conv2d_nhwc.x86 for op nn.conv2d
INFO:compile_engine:Use implementation injective.cpu for op nn.bias_add
WARNING:strategy:depthwise_conv2d NHWC layout is not optimized for x86.
```
I have used this before using TF models with no problems so I am wondering if
there is a particular issue with TFLite models. My test model is MobileNet_V2
from the Google Zoo. I can compile said model and run inference on the binaries
without tuning the graph.
Most likely I am missing something, but I could not find the definition of
`autotvm.task_extract_from_program` in the source code.
Any hints as to why the task list is empty would be greatly appreciated.
Thanks!
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