def transform_vstack(expr):
m = dim(expr, 0)
n = dim(expr, 1)
offset = 0
add_args = []
for arg in expr.arg:
mi = dim(arg, 0)
add_args.append(
expression.linear_map(
linear_map.left_matrix_product(
linear_map.transpose(
linear_map.index(slice(offset, offset + mi), m)), n),
transform_expr(arg)))
offset += mi
return expression.add(*add_args)
def transform_multiply(expr):
if len(expr.arg) != 2:
raise TransformError("wrong number of args", expr)
m = dim(expr, 0)
n = dim(expr, 1)
if expr.arg[0].dcp_props.constant:
A = multiply_constant(expr.arg[0], m)
B = promote(transform_expr(expr.arg[1]), n * n)
return expression.linear_map(linear_map.left_matrix_product(A, n), B)
if expr.arg[1].dcp_props.constant:
A = promote(transform_expr(expr.arg[0]), m * m)
B = multiply_constant(expr.arg[1], n)
return expression.linear_map(linear_map.right_matrix_product(B, m), A)
raise TransformError("multiplying non constants", expr)
def transform_vstack(expr):
m = dim(expr, 0)
n = dim(expr, 1)
offset = 0
add_args = []
for arg in expr.arg:
mi = dim(arg, 0)
add_args.append(
expression.linear_map(
linear_map.left_matrix_product(
linear_map.transpose(
linear_map.index(slice(offset, offset+mi), m)),
n),
transform_expr(arg)))
offset += mi
return expression.add(*add_args)
def transform_multiply(expr):
if len(expr.arg) != 2:
raise TransformError("wrong number of args", expr)
m = dim(expr, 0)
n = dim(expr, 1)
if expr.arg[0].dcp_props.constant:
A = multiply_constant(expr.arg[0], m)
B = promote(transform_expr(expr.arg[1]), n * n)
return expression.linear_map(linear_map.left_matrix_product(A, n), B)
if expr.arg[1].dcp_props.constant:
A = promote(transform_expr(expr.arg[0]), m * m)
B = multiply_constant(expr.arg[1], n)
return expression.linear_map(linear_map.right_matrix_product(B, m), A)
raise TransformError("multiplying non constants", expr)
