[Relay][Frontend][TFlite] Add add parser support for relational ops

Add support for: greater_equal, less, less_equal, equal, not_equal
Add tests for the elemwise relational ops

python/tvm/relay/frontend/tflite.py

@@ -89,6 +89,11 @@ def __init__(self, model, subgraph, exp_tab):
             'MAXIMUM': self.convert_maximum,
             'MINIMUM': self.convert_minimum,
             'GREATER': self.convert_greater,
+            'GREATER_EQUAL': self.convert_greater_equal,
+            'LESS': self.convert_less,
+            'LESS_EQUAL': self.convert_less_equal,
+            'EQUAL': self.convert_equal,
+            'NOT_EQUAL': self.convert_not_equal,
             'ZEROS_LIKE': self.convert_zeros_like,
             'REDUCE_MIN': self._convert_reduce_min,
             'REDUCE_MAX': self._convert_reduce_max,
@@ -747,6 +752,36 @@ def convert_squared_difference(self, op):
         out = _op.power(difference, relay.const(2, exp_type))
         return out
 
+    def convert_greater_equal(self, op):
+        if self.is_quantized(op):
+            raise tvm.error.OpNotImplemented(
+                'TFlite quantized GREATER_EQUAL operator is not supported yet.')
+        return self._convert_elemwise(_op.greater_equal, op)
+
+    def convert_less(self, op):
+        if self.is_quantized(op):
+            raise tvm.error.OpNotImplemented(
+                'TFlite quantized LESS operator is not supported yet.')
+        return self._convert_elemwise(_op.less, op)
+
+    def convert_less_equal(self, op):
+        if self.is_quantized(op):
+            raise tvm.error.OpNotImplemented(
+                'TFlite quantized LESS_EQUAL operator is not supported yet.')
+        return self._convert_elemwise(_op.less_equal, op)
+
+    def convert_equal(self, op):
+        if self.is_quantized(op):
+            raise tvm.error.OpNotImplemented(
+                'TFlite quantized EQUAL operator is not supported yet.')
+        return self._convert_elemwise(_op.equal, op)
+
+    def convert_not_equal(self, op):
+        if self.is_quantized(op):
+            raise tvm.error.OpNotImplemented(
+                'TFlite quantized NOT_EQUAL operator is not supported yet.')
+        return self._convert_elemwise(_op.not_equal, op)
+
     def convert_zeros_like(self, op):
         """Convert TFLite ZEROS LIKE"""
         try:

tests/python/frontend/tflite/test_forward.py

@@ -863,6 +863,42 @@ def _test_minimum(data):
 def _test_greater(data):
     """ One iteration of greater """
     return _test_elemwise(math_ops.greater, data)
+#######################################################################
+# Greater_equal
+# -------------
+
+def _test_greater_equal(data):
+    """ One iteration of greater_equal """
+    return _test_elemwise(math_ops.greater_equal, data)
+#######################################################################
+# Less
+# ----
+
+def _test_less(data):
+    """ One iteration of less """
+    return _test_elemwise(math_ops.less, data)
+#######################################################################
+# Less_equal
+# ----------
+
+def _test_less_equal(data):
+    """ One iteration of less_equal """
+    return _test_elemwise(math_ops.less_equal, data)
+#######################################################################
+# Equal
+# -----
+
+def _test_equal(data):
+    """ One iteration of equal """
+    return _test_elemwise(math_ops.equal, data)
+#######################################################################
+# Not_equal
+# ---------
+
+def _test_not_equal(data):
+    """ One iteration of not_equal"""
+    return _test_elemwise(math_ops.not_equal, data)
+#######################################################################
 
 #######################################################################
 # Squared_difference
@@ -915,6 +951,11 @@ def test_all_elemwise():
     _test_forward_elemwise(_test_minimum)
     _test_forward_elemwise(_test_greater)
     _test_forward_elemwise(_test_squared_difference)
+    _test_forward_elemwise(_test_greater_equal)
+    _test_forward_elemwise(_test_less)
+    _test_forward_elemwise(_test_less_equal)
+    _test_forward_elemwise(_test_equal)
+    _test_forward_elemwise(_test_not_equal)
 
 #######################################################################
 # Zeros like