torch.jit.isinstance

torch.jit.isinstance(obj, target_type)

This function provides for conatiner type refinement in TorchScript. It can refine parameterized containers of the List, Dict, Tuple, and Optional types. E.g. List[str], Dict[str, List[torch.Tensor]], Optional[Tuple[int,str,int]]. It can also refine basic types such as bools and ints that are available in TorchScript.

Parameters

• obj – object to refine the type of

• target_type – type to try to refine obj to

Returns

True if obj was successfully refined to the type of target_type,

False otherwise with no new type refinement

Return type

bool

Example (using torch.jit.isinstance for type refinement): .. testcode:

import torch
from typing import Any, Dict, List

class MyModule(torch.nn.Module):
    def __init__(self):
        super(MyModule, self).__init__()

    def forward(self, input: Any): # note the Any type
        if torch.jit.isinstance(input, List[torch.Tensor]):
            for t in input:
                y = t.clamp(0, 0.5)
        elif torch.jit.isinstance(input, Dict[str, str]):
            for val in input.values():
                print(val)

m = torch.jit.script(MyModule())
x = [torch.rand(3,3), torch.rand(4,3)]
m(x)
y = {"key1":"val1","key2":"val2"}
m(y)