Specialized numba sum impl

pytensor/link/numba/dispatch/elemwise.py

+import base64
+import pickle
 from functools import singledispatch
 from numbers import Number
-import pickle
 from textwrap import indent
-from typing import Any, Callable, Literal, Optional, Union
-import base64
+from typing import Any, Callable, Optional, Union
 
 import numba
 import numpy as np
-from llvmlite import ir
-from numba import TypingError, literal_unroll, types, literally
+from numba import TypingError, types
 from numba.core import cgutils
-from numba.cpython.unsafe.tuple import tuple_setitem
 from numba.np import arrayobj
 from numpy.core.numeric import normalize_axis_index, normalize_axis_tuple
 
@@ -18,6 +16,7 @@ from pytensor import config
 from pytensor.graph.basic import Apply
 from pytensor.graph.op import Op
 from pytensor.link.numba.dispatch import basic as numba_basic
+from pytensor.link.numba.dispatch import elemwise_codegen
 from pytensor.link.numba.dispatch.basic import (
     create_numba_signature,
     create_tuple_creator,
@@ -25,8 +24,6 @@ from pytensor.link.numba.dispatch.basic import (
     numba_njit,
     use_optimized_cheap_pass,
 )
-from pytensor.link.numba.dispatch.helpers import check_broadcasting, tuple_mapper
-from pytensor.link.numba.dispatch import elemwise_codegen
 from pytensor.link.utils import compile_function_src, get_name_for_object
 from pytensor.scalar.basic import (
     AND,
@@ -45,7 +42,7 @@ from pytensor.scalar.basic import (
 from pytensor.scalar.basic import add as add_as
 from pytensor.scalar.basic import scalar_maximum
 from pytensor.tensor.elemwise import CAReduce, DimShuffle, Elemwise
-from pytensor.tensor.math import MaxAndArgmax, MulWithoutZeros
+from pytensor.tensor.math import MaxAndArgmax, MulWithoutZeros, Sum
 from pytensor.tensor.special import LogSoftmax, Softmax, SoftmaxGrad
 from pytensor.tensor.type import scalar
 
@@ -376,8 +373,7 @@ def create_multiaxis_reducer(
     careduce_def_src = f"""
 def {careduce_fn_name}({input_name}):
 {careduce_assign_lines}
-    #return np.asarray({var_name})
-    return {var_name}
+    return np.asarray({var_name})
     """
 
     careduce_fn = compile_function_src(
@@ -447,6 +443,7 @@ _jit_options = {
     }
 }
 
+
 @numba.extending.intrinsic(jit_options=_jit_options, prefer_literal=True)
 def _vectorized(
     typingctx,
@@ -490,7 +487,6 @@ def _vectorized(
     inplace_pattern = inplace_pattern.literal_value
     inplace_pattern = pickle.loads(base64.decodebytes(inplace_pattern.encode()))
 
-    n_inputs = len(inputs)
     n_outputs = len(output_bc_patterns)
 
     if not len(inputs) > 0:
@@ -531,7 +527,10 @@ def _vectorized(
 
         [_, _, _, _, _, inputs] = args
         inputs = cgutils.unpack_tuple(builder, inputs)
-        inputs = [arrayobj.make_array(ty)(ctx, builder, val) for ty, val in zip(input_types, inputs)]
+        inputs = [
+            arrayobj.make_array(ty)(ctx, builder, val)
+            for ty, val in zip(input_types, inputs)
+        ]
         in_shapes = [cgutils.unpack_tuple(builder, obj.shape) for obj in inputs]
 
         iter_shape = elemwise_codegen.compute_itershape(
@@ -586,14 +585,22 @@ def _vectorized(
             return outputs[0]._getvalue()
 
         for inplace_idx in dict(inplace_pattern):
-            ctx.nrt.incref(builder, sig.return_type.types[inplace_idx], outputs[inplace_idx]._get_value())
-        return ctx.make_tuple(builder, sig.return_type, [out._getvalue() for out in outputs])
+            ctx.nrt.incref(
+                builder,
+                sig.return_type.types[inplace_idx],
+                outputs[inplace_idx]._get_value(),
+            )
+        return ctx.make_tuple(
+            builder, sig.return_type, [out._getvalue() for out in outputs]
+        )
 
     # TODO check inplace_pattern
-    ret_type = types.Tuple([
+    ret_type = types.Tuple(
+        [
             types.Array(numba.from_dtype(np.dtype(dtype)), ndim, "C")
             for dtype in output_dtypes
-    ])
+        ]
+    )
     if len(output_dtypes) == 1:
         ret_type = ret_type.types[0]
     sig = ret_type(*arg_types)
@@ -649,6 +656,40 @@ def numba_funcify_Elemwise(op, node, **kwargs):
     return elemwise_wrapper
 
 
+@numba_funcify.register(Sum)
+def numba_funcify_Sum(op, node, **kwargs):
+    axes = op.axis
+    if axes is None:
+        axes = list(range(node.inputs[0].ndim))
+
+    axes = list(axes)
+
+    ndim_input = node.inputs[0].ndim
+
+    if hasattr(op, "acc_dtype") and op.acc_dtype is not None:
+        acc_dtype = op.acc_dtype
+    else:
+        acc_dtype = node.outputs[0].type.dtype
+
+    np_acc_dtype = np.dtype(acc_dtype)
+
+    if ndim_input == len(axes):
+
+        @numba_njit(fastmath=True)
+        def impl_sum(array):
+            # TODO The accumulation itself should happen in acc_dtype...
+            return np.asarray(array.sum()).astype(np_acc_dtype)
+
+    else:
+
+        @numba_njit(fastmath=True)
+        def impl_sum(array):
+            # TODO The accumulation itself should happen in acc_dtype...
+            return array.sum(axes).astype(np_acc_dtype)
+
+    return impl_sum
+
+
 @numba_funcify.register(CAReduce)
 def numba_funcify_CAReduce(op, node, **kwargs):
     axes = op.axis

pytensor/link/numba/dispatch/elemwise_codegen.py

+import numba
+import numpy as np
 from llvmlite import ir
 from numba import types
-from numba.np import arrayobj
 from numba.core import cgutils
-import numba
-import numpy as np
+from numba.np import arrayobj
 
 
 def compute_itershape(
@@ -35,7 +35,9 @@ def compute_itershape(
     return shape
 
 
-def make_outputs(ctx, builder: ir.IRBuilder, iter_shape, out_bc, dtypes, inplace, inputs, input_types):
+def make_outputs(
+    ctx, builder: ir.IRBuilder, iter_shape, out_bc, dtypes, inplace, inputs, input_types
+):
     arrays = []
     ar_types: list[types.Array] = []
     one = ir.IntType(64)(1)
@@ -52,8 +54,7 @@ def make_outputs(ctx, builder: ir.IRBuilder, iter_shape, out_bc, dtypes, inplace
         # This is actually an interal numba function, I guess we could
         # call `numba.nd.unsafe.ndarray` instead?
         shape = [
-            length if not bc_dim else one
-            for length, bc_dim in zip(iter_shape, bc)
+            length if not bc_dim else one for length, bc_dim in zip(iter_shape, bc)
         ]
         array = arrayobj._empty_nd_impl(ctx, builder, arrtype, shape)
         arrays.append(array)
@@ -84,7 +85,7 @@ def make_loop_call(
     safe = (False, False)
     n_outputs = len(outputs)
 
-    #context.printf(builder, "iter shape: " + ', '.join(["%i"] * len(iter_shape)) + "\n", *iter_shape)
+    # context.printf(builder, "iter shape: " + ', '.join(["%i"] * len(iter_shape)) + "\n", *iter_shape)
 
     # Lower the code of the scalar function so that we can use it in the inner loop
     # Caching is set to false to avoid a numba bug TODO ref?
@@ -155,12 +156,8 @@ def make_loop_call(
     # Load values from input arrays
     input_vals = []
     for array_info, bc in zip(inputs, input_bc, strict=True):
-        idxs_bc = [
-            zero if bc else idx for idx, bc in zip(idxs, bc, strict=True)
-        ]
-        ptr = cgutils.get_item_pointer2(
-            context, builder, *array_info, idxs_bc, *safe
-        )
+        idxs_bc = [zero if bc else idx for idx, bc in zip(idxs, bc, strict=True)]
+        ptr = cgutils.get_item_pointer2(context, builder, *array_info, idxs_bc, *safe)
         val = builder.load(ptr)
         # val.set_metadata("alias.scope", input_scope_set)
         # val.set_metadata("noalias", output_scope_set)
@@ -193,12 +190,9 @@ def make_loop_call(
             # store.set_metadata("noalias", input_scope_set)
         else:
             idxs_bc = [
-                zero if bc else idx
-                for idx, bc in zip(idxs, output_bc[i], strict=True)
+                zero if bc else idx for idx, bc in zip(idxs, output_bc[i], strict=True)
             ]
-            ptr = cgutils.get_item_pointer2(
-                context, builder, *outputs[i], idxs_bc
-            )
+            ptr = cgutils.get_item_pointer2(context, builder, *outputs[i], idxs_bc)
             # store = builder.store(value, ptr)
             arrayobj.store_item(context, builder, output_types[i], value, ptr)
             # store.set_metadata("alias.scope", output_scope_set)
@@ -210,9 +204,7 @@ def make_loop_call(
             if accu_depth == depth:
                 idxs_bc = [
                     zero if bc else idx
-                    for idx, bc in zip(
-                        idxs, output_bc[output], strict=True
-                    )
+                    for idx, bc in zip(idxs, output_bc[output], strict=True)
                 ]
                 ptr = cgutils.get_item_pointer2(
                     context, builder, *outputs[output], idxs_bc
@@ -221,9 +213,7 @@ def make_loop_call(
                 # load.set_metadata("alias.scope", output_scope_set)
                 # load.set_metadata("noalias", input_scope_set)
                 # store = builder.store(load, ptr)
-                arrayobj.store_item(
-                    context, builder, output_types[output], load, ptr
-                )
+                arrayobj.store_item(context, builder, output_types[output], load, ptr)
                 # store.set_metadata("alias.scope", output_scope_set)
                 # store.set_metadata("noalias", input_scope_set)
         loop.__exit__(None, None, None)