Hi,

I've been exploring VTA and am trying out different configurations editing the 
`vta_config.json`  file. 

For some configuartions, when running `make`, I get the following error: 

`/tvm/vta/runtime/runtime.cc:46:29: error: static assertion failed: 
VTA_UOP_WIDTH do not match VTAUop size`

I have the following questions:
* The corresponding comment in the code says `Avoid bad configurations.` Does 
this mean that the configurations that trigger this are simply not supported 
(yet?), and if so does this include every configuration with this 
parameter-value pair? 
For example I get this by setting `LOG_WGT_WIDTH` to 2 and leaving every other 
parameter as default. Does that mean that any configuration with 4-bit weights 
will trigger this or might it work in combination with some other parameter. 

* In what way does changing `LOG_WEIGHT_WIDTH` or `LOG_INP_BUFF_SIZE` impact 
the `UOP_WIDTH`? It doesn't really make sense to me so please let me know what 
I've missed.

Thanks!





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