// returning the record ID.
	Lookup(ctx context.Context, m module.Version) (int64, error)

	// ReadTileData reads the content of tile t.
	// It is only invoked for hash tiles (t.L ≥ 0).
	ReadTileData(ctx context.Context, t tlog.Tile) ([]byte, error)
}

// A Server is the checksum database HTTP server,
// which implements http.Handler and should be invoked
// to serve the paths listed in [ServerPaths].

go list -x -m all  # Download go.mod files.
! stderr github
stderr proxy.golang.org/rsc.io/quote
! stderr sum.golang.org/tile
! stderr sum.golang.org/lookup/rsc.io/quote

go list -x -deps rsc.io/quote  # Download module source.
! stderr github
stderr proxy.golang.org/rsc.io/quote
! stderr sum.golang.org/tile
! stderr sum.golang.org/lookup/rsc.io/quote

cmp go.sum saved.sum


# Download again.

 Pad 1
 ReadVariableOp 646
 Relu 49
 ReluGrad 49
 Reshape 2
 ResourceApplyKerasMomentum 161
 ShapeN 50
 Softmax 1
 SparseSoftmaxCrossEntropyWithLogits 1
 Square 55
 Squeeze 1
 Sub 106
 Sum 57
 Tile 1

 Mean 1
 Mul 218
 Pad 2
 ReadVariableOp 538
 Relu 49
 ReluGrad 49
 Reshape 2
 ResourceApplyKerasMomentum 161
 Slice 1
 Softmax 1
 SparseSoftmaxCrossEntropyWithLogits 1
 Squeeze 1
 Sum 1
 Tile 1
 Transpose 1
cluster 1 size 815
 AddN 1
 AssignAddVariableOp 1
 AssignSubVariableOp 106
 Const 220
 DivNoNan 1
 Identity 1
 Mul 161
 ReadVariableOp 106
 Square 55
 Sub 106

    "StopGradient",
    "StridedSlice",
    "StridedSliceGrad",
    "TensorScatterAdd",
    "TensorScatterMax",
    "TensorScatterMin",
    "TensorScatterSub",
    "TensorStridedSliceUpdate",
    "Tile",
    "TileGrad",
    "Transpose",
    "Unique",
    "UniqueV2",
    "UniqueWithCounts",
    "UniqueWithCountsV2",
    "Unpack",
    "UnravelIndex",
    "Where",
    "ZerosLike",

 Minimum 1
 Mul 3
 Pack 2
 Pad 1
 Range 1
 RealDiv 1
 Reshape 8
 Shape 7
 Size 1
 Slice 2
 Snapshot 5
 SparseSoftmaxCrossEntropyWithLogits 1
 StridedSlice 2
 Sub 3
 Sum 1
 Tile 1
 Transpose 2
 Unpack 1
cluster 2 size 44
 Cast 2
 ConcatV2 2
 Const 18
 ExpandDims 1
 GatherV2 2
 Less 1
 MatMul 1
 Mul 1
 Pack 1
 Prod 2
 Range 1
 Reshape 3

	if err != nil {
		panic(err)
	}
	s.hashes = append(s.hashes, hashes...)

	return id, nil
}

func (s *TestServer) ReadTileData(ctx context.Context, t tlog.Tile) ([]byte, error) {
	s.mu.Lock()
	defer s.mu.Unlock()

	return tlog.ReadTileData(t, s.hashes)

  %multiples = "tf.Const"() { device = "/device:CPU:0", value = dense<[7,3]> : tensor<2xi32> } : () -> tensor<2xi32>
  // CHECK: T = !corert.string
  %output = "tf.Tile"(%arg, %multiples) { device = "/device:CPU:0" } : (tensor<1x2x!tf_type.string>, tensor<2xi32>) -> tensor<?x6x!tf_type.string>
  func.return %output : tensor<?x6x!tf_type.string>
}

// CHECK-LABEL: func @shape

	var hash Hash
	copy(hash[:], h)
	return Tree{n, hash}, nil
}

var errMalformedRecord = errors.New("malformed record data")

// FormatRecord formats a record for serving to a client
// in a lookup response or data tile.
//
// The encoded form is the record ID as a single number,
// then the text of the record, and then a terminating blank line.
// Record text must be valid UTF-8 and must not contain any ASCII control

// A sharding with OTHER type may be REPLICATED if:
// 'replicate_on_last_tile_dim' is true OR
// 'last_tile_dims' is not empty
// AND
// other than replicated last tile dims, all other dims are not sharded.
bool IsOtherReplicatedSharding(const xla::OpSharding& xla_sharding);

// Returns whether the sharding is split sharding. i.e. A sharding with OTHER
// type but not replicated.