add parser support for GREATER tflite operator (apache#3963)

add test for GREATER

Author: inadob

python/tvm/relay/frontend/tflite.py

@@ -74,6 +74,7 @@ def __init__(self, model, subgraph, exp_tab):
             'POW': self.convert_pow,
             'MAXIMUM': self.convert_maximum,
             'MINIMUM': self.convert_minimum,
+            'GREATER': self.convert_greater,
             'REDUCE_MIN': self._convert_reduce_min,
             'REDUCE_MAX': self._convert_reduce_max,
             'MEAN': self._convert_reduce_mean,
@@ -456,6 +457,9 @@ def convert_maximum(self, op):
     def convert_minimum(self, op):
         return self._convert_elemwise(_op.minimum, op)
 
+    def convert_greater(self, op):
+        return self._convert_elemwise(_op.greater, op)
+
     def _convert_reduce(self, relay_op, op):
         """Generic method to Convert TFLite MEAN operators"""
         try:

tests/python/frontend/tflite/test_forward.py

@@ -597,6 +597,13 @@ def _test_maximum(data):
 def _test_minimum(data):
     """ One iteration of minimum """
     return _test_elemwise(math_ops.minimum, data)
+#######################################################################
+# Greater
+# -------
+
+def _test_greater(data):
+    """ One iteration of greater """
+    return _test_elemwise(math_ops.greater, data)
 
 def _test_forward_elemwise(testop):
     """ Elewise"""
@@ -623,6 +630,7 @@ def test_all_elemwise():
     _test_forward_elemwise(_test_pow)
     _test_forward_elemwise(_test_maximum)
     _test_forward_elemwise(_test_minimum)
+    _test_forward_elemwise(_test_greater)
 
 #######################################################################
 # Reduce