Assign operation

mlir_graphblas/operators.py

@@ -60,7 +60,9 @@ def __init__(self, func, *, input=None, output=None):
         If input is defined, it must be one of (bool, int, float) to
             indicate the restricted allowable input dtypes
         If output is defined, it must be one of (bool, int, float) to
-            indicate the output will always be of that type
+            indicate the output will always be of that type or an
+            an integer (0, 1, ...) to indicate that the output dtype
+            will match the dtype of argument 0, 1, ...
         """
         super().__init__(func.__name__)
         self.func = func
@@ -70,7 +72,8 @@ def __init__(self, func, *, input=None, output=None):
         self.input = input
         # Validate output
         if output is not None:
-            assert output in {bool, int, float}
+            if type(output) is not int:
+                assert output in {bool, int, float}
         self.output = output
 
     @classmethod
@@ -94,9 +97,19 @@ def validate_input(self, input_val):
         elif self.input is float and not val_dtype.is_float():
             raise GrbDomainMismatch("input must be float type")
 
-    def get_output_type(self, input_dtype):
+    def get_output_type(self, left_input_dtype, right_input_dtype=None):
         if self.output is None:
-            return input_dtype
+            if right_input_dtype is None:
+                return left_input_dtype
+            if left_input_dtype != right_input_dtype:
+                raise TypeError(f"Unable to infer output type from {left_input_dtype} and {right_input_dtype}")
+            return left_input_dtype
+        elif self.output == 0:
+            return left_input_dtype
+        elif self.output == 1:
+            if right_input_dtype is None:
+                raise TypeError("No type provided for expected 2nd input argument")
+            return right_input_dtype
         return self._type_convert[self.output]
 
 
@@ -132,6 +145,13 @@ def name_of_op(x, y, input_dtype):
     def __call__(self, x, y):
         dtype = self._dtype_of(x)
         dtype2 = self._dtype_of(y)
+        if self.output == 0:
+            self.validate_input(x)
+            return self.func(x, y, dtype)
+        if self.output == 1:
+            self.validate_input(y)
+            return self.func(x, y, dtype2)
+        # If we reached this point, inputs must have the same dtype
         if dtype is not dtype2:
             raise TypeError(f"Types must match, {dtype} != {dtype2}")
         self.validate_input(x)
@@ -417,12 +437,12 @@ def oneb(x, y, dtype):
 BinaryOp.pair = BinaryOp.oneb
 
 
-@BinaryOp._register
+@BinaryOp._register(output=0)  # dtype matches x
 def first(x, y, dtype):
     return x
 
 
-@BinaryOp._register
+@BinaryOp._register(output=1)  # dtype matches y
 def second(x, y, dtype):
     return y
 

mlir_graphblas/tensor.py

@@ -246,8 +246,8 @@ def __repr__(self):
         return f'Vector<{self.dtype.gb_name}, size={self.shape[0]}>'
 
     @classmethod
-    def new(cls, dtype, size: int):
-        return cls(dtype, (size,))
+    def new(cls, dtype, size: int, *, intermediate_result=False):
+        return cls(dtype, (size,), intermediate_result=intermediate_result)
 
     def resize(self, size: int):
         raise NotImplementedError()
@@ -271,6 +271,7 @@ def build(self, indices, values, *, dup=None, sparsity=None):
 
         indices: list or numpy array of int
         values: list or numpy array with matching dtype as declared in `.new()`
+                can also be a scalar value to make the Vector iso-valued
         dup: BinaryOp used to combined entries with the same index
              NOTE: this is currently not support; passing dup will raise an error
         sparsity: list of string or DimLevelType
@@ -287,7 +288,17 @@ def build(self, indices, values, *, dup=None, sparsity=None):
         if not isinstance(indices, np.ndarray):
             indices = np.array(indices, dtype=np.uint64)
         if not isinstance(values, np.ndarray):
-            values = np.array(values, dtype=self.dtype.np_type)
+            if hasattr(values, '__len__'):
+                values = np.array(values, dtype=self.dtype.np_type)
+            else:
+                if type(values) is Scalar:
+                    if values.dtype != self.dtype:
+                        raise TypeError("Scalar value must have same dtype as Vector")
+                    if values.nvals() == 0:
+                        # Empty Scalar means nothing to build
+                        return
+                    values = values.extract_element()
+                values = np.ones(indices.shape, dtype=self.dtype.np_type) * values
         if sparsity is None:
             sparsity = [DimLevelType.compressed]
         self._to_sparse_tensor(indices, values, sparsity=sparsity, ordering=[0])
@@ -329,8 +340,8 @@ def is_colwise(self):
         return tuple(self._ordering) != self.permutation
 
     @classmethod
-    def new(cls, dtype, nrows: int, ncols: int):
-        return cls(dtype, (nrows, ncols))
+    def new(cls, dtype, nrows: int, ncols: int, *, intermediate_result=False):
+        return cls(dtype, (nrows, ncols), intermediate_result=intermediate_result)
 
     def diag(self, k: int):
         raise NotImplementedError()
@@ -356,13 +367,15 @@ def nvals(self):
 
         return nvals(self)
 
-    def build(self, row_indices, col_indices, values, *, dup=None, sparsity=None, colwise=False):
+    def build(self, row_indices, col_indices, values, *,
+              dup=None, sparsity=None, colwise=False):
         """
         Build the underlying MLIRSparseTensor structure from COO.
 
         row_indices: list or numpy array of int
         col_indices: list or numpy array of int
         values: list or numpy array with matching dtype as declared in `.new()`
+                can also be a scalar value to make the Vector iso-valued
         dup: BinaryOp used to combined entries with the same (row, col) coordinate
              NOTE: this is currently not support; passing dup will raise an error
         sparsity: list of string or DimLevelType
@@ -383,7 +396,17 @@ def build(self, row_indices, col_indices, values, *, dup=None, sparsity=None, co
             col_indices = np.array(col_indices, dtype=np.uint64)
         indices = np.stack([row_indices, col_indices], axis=1)
         if not isinstance(values, np.ndarray):
-            values = np.array(values, dtype=self.dtype.np_type)
+            if hasattr(values, '__len__'):
+                values = np.array(values, dtype=self.dtype.np_type)
+            else:
+                if type(values) is Scalar:
+                    if values.dtype != self.dtype:
+                        raise TypeError("Scalar value must have same dtype as Matrix")
+                    if values.nvals() == 0:
+                        # Empty Scalar means nothing to build
+                        return
+                    values = values.extract_element()
+                values = np.ones(indices.shape, dtype=self.dtype.np_type) * values
         ordering = [1, 0] if colwise else [0, 1]
         if sparsity is None:
             sparsity = [DimLevelType.dense, DimLevelType.compressed]