Hi:

An error occurs when a `slice`

op with `begin=0`

and `size = 0`

is converted with `relay.frontend.from_tensorflow`

. According to Tensorflow, the result of the `slice`

op should be an empty array. It seems that `StridedSliceRel`

from `transformer.cc`

does not account for this situation.

The code to reproduce the error:

```
import tensorflow as tf
from tvm import relay
def main():
slice_graph = tf.Graph()
with slice_graph.as_default():
shape = tf.constant([19], shape=[1], dtype=tf.int32)
begin = tf.constant([0], shape=[1], dtype=tf.int32)
size = tf.constant([0], shape=[1], dtype=tf.int32)
result = tf.slice(shape, begin, size)
slice_graph_def = slice_graph.as_graph_def(add_shapes=True)
mod, params = relay.frontend.from_tensorflow(
slice_graph_def,
layout=None)
if __name__ == '__main__':
main()
```