init

inference.py

@@ -0,0 +1,254 @@
+import numpy as np
+
+np.set_printoptions(precision=4, suppress=True, linewidth=200)
+import types, torch
+from torch.nn import functional as F
+
+MyModule = torch.jit.ScriptModule
+MyFunction = torch.jit.script_method
+
+
+class RWKV_TOKENIZER():
+    table: list[list[list[bytes]]]
+    good: list[set[int]]
+    wlen: list[int]
+
+    def __init__(self, file_name):
+        self.idx2token = {}
+        sorted = []  # must be already sorted
+        lines = open(file_name, "r", encoding="utf-8").readlines()
+        for l in lines:
+            idx = int(l[:l.index(' ')])
+            x = eval(l[l.index(' '):l.rindex(' ')])
+            x = x.encode("utf-8") if isinstance(x, str) else x
+            assert isinstance(x, bytes)
+            assert len(x) == int(l[l.rindex(' '):])
+            sorted += [x]
+            self.idx2token[idx] = x
+
+        self.token2idx = {}
+        for k, v in self.idx2token.items():
+            self.token2idx[v] = int(k)
+
+        # precompute some tables for fast matching
+        self.table = [[[] for j in range(256)] for i in range(256)]
+        self.good = [set() for i in range(256)]
+        self.wlen = [0 for i in range(256)]
+
+        for i in reversed(range(len(sorted))):  # reverse order - match longer tokens first
+            s = sorted[i]
+            if len(s) >= 2:
+                s0 = int(s[0])
+                s1 = int(s[1])
+                self.table[s0][s1] += [s]
+                self.wlen[s0] = max(self.wlen[s0], len(s))
+                self.good[s0].add(s1)
+
+    def encodeBytes(self, src: bytes) -> list[int]:
+        src_len: int = len(src)
+        tokens: list[int] = []
+        i: int = 0
+        while i < src_len:
+            s: bytes = src[i: i + 1]
+
+            if i < src_len - 1:
+                s1: int = int(src[i + 1])
+                s0: int = int(src[i])
+                if s1 in self.good[s0]:
+                    sss: bytes = src[i: i + self.wlen[s0]]
+                    try:
+                        s = next(filter(sss.startswith, self.table[s0][s1]))
+                    except:
+                        pass
+            tokens.append(self.token2idx[s])
+            i += len(s)
+
+        return tokens
+
+    def decodeBytes(self, tokens):
+        return b''.join(map(lambda i: self.idx2token[i], tokens))
+
+    def encode(self, src: str):
+        return self.encodeBytes(src.encode("utf-8"))
+
+    def decode(self, tokens):
+        return self.decodeBytes(tokens).decode('utf-8')
+
+    def printTokens(self, tokens):
+        for i in tokens:
+            s = self.idx2token[i]
+            try:
+                s = s.decode('utf-8')
+            except:
+                pass
+            print(f'{repr(s)}{i}', end=' ')
+            # print(repr(s), i)
+        print()
+
+
+########################################################################################################
+
+def sample_logits(out, temperature=1.0, top_p=0.8):
+    probs = F.softmax(out, dim=-1).numpy()
+    sorted_probs = np.sort(probs)[::-1]
+    cumulative_probs = np.cumsum(sorted_probs)
+    cutoff = float(sorted_probs[np.argmax(cumulative_probs > top_p)])
+    probs[probs < cutoff] = 0
+    if temperature != 1.0:
+        probs = probs.pow(1.0 / temperature)
+    probs = probs / np.sum(probs)
+    out = np.random.choice(a=len(probs), p=probs)
+    return out
+
+
+########################################################################################################
+class RWKV_RNN(MyModule):
+    def __init__(self, args):
+        super().__init__()
+        self.args = args
+        self.eval()  # set torch to inference mode
+
+        w = torch.load(args.MODEL_NAME + '.pth', map_location='cpu')
+
+        for k in w.keys():
+            w[k] = w[k].float()  # convert to f32 type
+            if '.time_' in k: w[k] = w[k].squeeze()
+            if '.time_faaaa' in k: w[k] = w[k].unsqueeze(-1)
+
+        self.n_head = w['blocks.0.att.time_faaaa'].shape[0]
+        self.head_size = w['blocks.0.ln1.weight'].shape[0] // self.n_head
+
+        self.w = types.SimpleNamespace()  # set self.w from w
+        self.w.blocks = {}
+        for k in w.keys():  # example: "blocks.0.att.time_first" => self.w.blocks[0].att.time_first
+            parts = k.split('.')
+            last = parts.pop()
+            here = self.w
+            for p in parts:
+                if p.isdigit():
+                    p = int(p)
+                    if p not in here: here[p] = types.SimpleNamespace()
+                    here = here[p]
+                else:
+                    if not hasattr(here, p): setattr(here, p, types.SimpleNamespace())
+                    here = getattr(here, p)
+            setattr(here, last, w[k])
+
+    def layer_norm(self, x, w):
+        return F.layer_norm(x, (self.args.n_embd,), weight=w.weight, bias=w.bias)
+
+    @MyFunction
+    def channel_mixing(self, x, state, i: int, time_maa_k, time_maa_r, kw, vw, rw):
+        i0 = (2 + self.head_size) * i + 0
+        sx = state[i0] - x
+        xk = x + sx * time_maa_k
+        xr = x + sx * time_maa_r
+        state[i0] = x
+        r = torch.sigmoid(rw @ xr)
+        k = torch.square(torch.relu(kw @ xk))  # square relu, primer paper
+        return r * (vw @ k)
+
+    @MyFunction
+    def time_mixing(self, x, state, i: int, x_maa, w_maa, k_maa, v_maa, r_maa, g_maa, tm_w1, tm_w2, td_w1, td_w2,
+                    time_first, time_decay, kw, vw, rw, gw, ow, ln_w, ln_b):
+        H = self.n_head
+        S = self.head_size
+
+        i1 = (2 + S) * i + 1
+        sx = state[i1] - x
+        state[i1] = x
+        xxx = x + sx * x_maa
+        xxx = torch.tanh(xxx @ tm_w1).view(5, 1, -1)
+        xxx = torch.bmm(xxx, tm_w2).view(5, -1)
+        mw, mk, mv, mr, mg = xxx.unbind(dim=0)
+
+        xw = x + sx * (w_maa + mw)
+        xk = x + sx * (k_maa + mk)
+        xv = x + sx * (v_maa + mv)
+        xr = x + sx * (r_maa + mr)
+        xg = x + sx * (g_maa + mg)
+
+        w = (time_decay + (torch.tanh(xw @ td_w1) @ td_w2).float()).view(H, S, 1)
+        w = torch.exp(-torch.exp(w.float()))
+
+        r = (rw @ xr).view(H, 1, S)
+        k = (kw @ xk).view(H, S, 1)
+        v = (vw @ xv).view(H, 1, S)
+        g = F.silu(gw @ xg)
+
+        s = state[(2 + S) * i + 2:(2 + S) * (i + 1), :].reshape(H, S, S)
+
+        x = torch.zeros(H, S)
+        a = k @ v
+        x = r @ (time_first * a + s)
+        s = a + w * s
+
+        state[(2 + S) * i + 2:(2 + S) * (i + 1), :] = s.reshape(S, -1)
+        x = x.flatten()
+
+        x = F.group_norm(x.unsqueeze(0), num_groups=H, weight=ln_w, bias=ln_b, eps=64e-5).squeeze(
+            0) * g  # same as gn(x/8, eps=1e-5)
+        return ow @ x
+
+    def forward(self, token, state):
+        with torch.no_grad():
+            if state == None:
+                state = torch.zeros(self.args.n_layer * (2 + self.head_size), self.args.n_embd)
+
+            x = self.w.emb.weight[token]
+            x = self.layer_norm(x, self.w.blocks[0].ln0)
+            for i in range(self.args.n_layer):
+                att = self.w.blocks[i].att
+                x = x + self.time_mixing(self.layer_norm(x, self.w.blocks[i].ln1), state, i,
+                                         att.time_maa_x, att.time_maa_w, att.time_maa_k, att.time_maa_v, att.time_maa_r,
+                                         att.time_maa_g, att.time_maa_w1, att.time_maa_w2,
+                                         att.time_decay_w1, att.time_decay_w2, att.time_faaaa, att.time_decay,
+                                         att.key.weight, att.value.weight, att.receptance.weight, att.gate.weight,
+                                         att.output.weight,
+                                         att.ln_x.weight, att.ln_x.bias)
+                ffn = self.w.blocks[i].ffn
+                x = x + self.channel_mixing(self.layer_norm(x, self.w.blocks[i].ln2), state, i,
+                                            ffn.time_maa_k, ffn.time_maa_r,
+                                            ffn.key.weight, ffn.value.weight, ffn.receptance.weight)
+
+            x = self.w.head.weight @ self.layer_norm(x, self.w.ln_out)
+            return x.float(), state
+
+
+tokenizer = RWKV_TOKENIZER("vocab_v20230424.txt")
+
+args = types.SimpleNamespace()
+args.MODEL_NAME = 'rwkv-30'
+args.n_layer = 12
+args.n_embd = 768
+args.vocab_size = 65536
+
+context = "Today is a beautiful"
+NUM_TRIALS = 3
+LENGTH_PER_TRIAL = 50
+TEMPERATURE = 1.0
+TOP_P = 0.7
+
+print(f'model= {args.MODEL_NAME}\n')
+model = RWKV_RNN(args)
+init_state = None
+for token in tokenizer.encode(context):
+    init_out, init_state = model.forward(token, init_state)
+
+for TRIAL in range(NUM_TRIALS):
+    print(f'Trial {TRIAL + 1}=', context, end="")
+    all_tokens = []
+    n_sampled = 0
+    out, state = init_out.clone(), init_state.clone()
+    for i in range(LENGTH_PER_TRIAL):
+        token = sample_logits(out, TEMPERATURE, TOP_P)
+        all_tokens += [token]
+        try:
+            tmp = tokenizer.decode(all_tokens[n_sampled:])
+            if '\ufffd' not in tmp:  # only print when we have a valid utf-8 string
+                print(tmp, end="", flush=True)
+                n_sampled = i + 1
+        except:
+            pass
+        out, state = model.forward(token, state)
+    print("\nSampled tokens=", n_sampled, "out of", LENGTH_PER_TRIAL, "tokens\n")