kevinthesun commented on a change in pull request #4502:
[Relay][Frontend][TFlite] Add parses support for SLICE
URL: https://github.com/apache/incubator-tvm/pull/4502#discussion_r358957796
##########
File path: python/tvm/relay/frontend/tflite.py
##########
@@ -1033,6 +1034,35 @@ def convert_split(self, op):
return out
+ def convert_slice(self, op):
+ """Convert TFLite SLICE"""
+ try:
+ from tflite.Operator import Operator
+ except ImportError:
+ raise ImportError("The tflite package must be installed")
+
+ assert isinstance(op, Operator)
+ input_tensors = self.get_input_tensors(op)
+ assert len(input_tensors) == 3, "input tensors length should be == 3"
+ input_tensor = input_tensors[0]
+ in_expr = self.get_expr(input_tensor.tensor_idx)
+
+ begin = list(self.get_tensor_value(input_tensors[1]))
+ size = list(self.get_tensor_value(input_tensors[2]))
+ # strided_slice(Relay) needs the slice's end indices, not the size
+ end = size
+ input_tensor_shape = input_tensor.tensor.ShapeAsNumpy()
+ input_tensor_rank = len(input_tensor_shape)
+ for i in range(input_tensor_rank):
+ if size[i] == -1:
+ end[i] = input_tensor_shape[i] - begin[i] + 1
Review comment:
end[i] is the last element which not included in the slice. size = -1
requires all remaining elements included. If end[i] = data_shape[i] - 1, the
last element is dropped.
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