web/tests/python/websock_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 util, emcc
import numpy as np

proxy_host = "localhost"
proxy_port = 9090


def test_rpc():
    if not tvm.runtime.enabled("rpc"):
        return
    # generate the wasm library
    target = "llvm -mtriple=wasm32-unknown-unknown-wasm -system-lib"
    if not tvm.runtime.enabled(target):
        raise RuntimeError("Target %s is not enbaled" % target)
    n = te.var("n")
    A = te.placeholder((n,), name="A")
    B = te.compute(A.shape, lambda *i: A(*i) + 1.0, name="B")
    s = te.create_schedule(B.op)

    fadd = tvm.build(s, [A, B], target, name="addone")
    temp = util.tempdir()

    wasm_path = temp.relpath("addone.wasm")
    fadd.export_library(wasm_path, emcc.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):
        # basic function checks.
        faddone = remote.get_function("testing.asyncAddOne")
        fecho = remote.get_function("testing.echo")
        assert faddone(100) == 101
        assert fecho(1, 2, 3) == 1
        assert fecho(1, 2, 3) == 1
        assert fecho(100, 2, 3) == 100
        assert fecho("xyz") == "xyz"
        assert bytes(fecho(bytearray(b"123"))) == b"123"

        # run the generated library.
        f1 = remote.system_lib()
        ctx = remote.cpu(0)
        a = tvm.nd.array(np.random.uniform(size=1024).astype(A.dtype), ctx)
        b = tvm.nd.array(np.zeros(1024, dtype=A.dtype), ctx)
        # invoke the function
        addone = f1.get_function("addone")
        addone(a, b)

        # time evaluator
        time_f = f1.time_evaluator("addone", ctx, number=100, repeat=10)
        time_f(a, b)
        cost = time_f(a, b).mean
        print("%g secs/op" % cost)
        np.testing.assert_equal(b.asnumpy(), a.asnumpy() + 1)

    check(remote)


test_rpc()