web/tests/python/webgpu_rpc_test.py

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"""Simple testcode to test Javascript RPC

To use it, start a rpc proxy with "python -m tvm.exec.rpc_proxy".
Connect javascript end to the websocket port and connect to the RPC.
"""

import tvm
from tvm import te
from tvm import rpc
from tvm.contrib import utils, tvmjs
import numpy as np

proxy_host = "127.0.0.1"
proxy_port = 9090


def test_rpc():
    if not tvm.runtime.enabled("rpc"):
        return
    # generate the wasm library
    target = tvm.target.Target(
        "webgpu", host={"kind": "llvm", "mtriple": "wasm32-unknown-unknown-wasm"}
    )

    n = te.var("n")
    A = te.placeholder((n,), name="A")
    B = te.compute(A.shape, lambda *i: te.log(te.abs(A(*i) + 1)), name="B")
    mod = tvm.IRModule.from_expr(te.create_prim_func([A, B]))
    sch = tvm.s_tir.Schedule(mod)
    (i,) = sch.get_loops(block=sch.get_sblock("B"))
    i0, i1 = sch.split(i, [None, 32])
    sch.bind(i0, "blockIdx.x")
    sch.bind(i1, "threadIdx.x")

    fadd = tvm.build(sch.mod.with_attr("system_lib_prefix", ""), target=target)
    temp = utils.tempdir()

    wasm_path = temp.relpath("addone_gpu.wasm")
    fadd.export_library(wasm_path, fcompile=tvmjs.create_tvmjs_wasm)

    wasm_binary = open(wasm_path, "rb").read()
    remote = rpc.connect(
        proxy_host,
        proxy_port,
        key="wasm",
        session_constructor_args=["rpc.WasmSession", wasm_binary],
    )

    def check(remote, size):
        # basic function checks.
        dev = remote.webgpu(0)
        adata = np.random.uniform(size=size).astype(A.dtype)
        a = tvm.runtime.tensor(adata, dev)
        b = tvm.runtime.tensor(np.zeros(size, dtype=A.dtype), dev)

        np.testing.assert_equal(a.numpy(), adata)
        f1 = remote.system_lib()
        addone = f1.get_function("main")
        addone(a, b)
        tvm.testing.assert_allclose(b.numpy(), np.log(np.abs(a.numpy()) + 1), atol=1e-5, rtol=1e-5)
        print("Test pass..")

    check(remote, 71821 * 32)


test_rpc()